If we're labeling violence committed for political ends as terrorism, then Antifa is currently winning, big, even in the US. Antifa was only recently labeled a terrorist organization and that stat regarding the US doesn't account for that. That said, for the most part, not counting Antifa, that is true. I think it's important to note though that in focusing on the US, it leaves out the rest of the world, and once you look at the entire world, you've got Islamic violence, left-wing violence, and then right-wing violence, in that order, in the last 15ish years.
I'd also remind you that we've had the bike lock attacker, Steve Scalise, and Jeremy Christian who, despite media spin, was a full-blown Sanders supporter. I don't consider people like Dylan Roof to be a member of the alt-right, and I'm pretty far left myself. I don't categorize things as "right-wing terrorism" or "left-wing terrorism." I care about specific people and the groups they support. The reality is that any given member of Antifa is far more likely to have assaulted someone, or destroyed someone else's property than a member of the alt-right.
The NJ office of Homeland Security has labeled them a domestic terrorist organization, and for (arguably) good reason. At the very least they should be treated as a criminal organization, and it turns out they have in fact been treated exactly as that. They're communists, and they've proven time and time again they won't hesitate to beat and kick already-unconscious people, or brain someone with bike locks, or, in other parts of the world, set cops on fire with Molotov cocktails. Their "issues" that they want addressed, are that they want a communist society, they want Trump gone, and they want to prevent people with a certain ideology from exercising their free speech rights. I don't like fascists, and I've repeatedly argued against Spencer's white ethno-State in the past, but Antifa is just as bad, arguably worse, than the alt-right for the damage they have already caused.
Not to sound like a libertarian meme, but communism is always one execution away from their idyllic social vision. Most of them are what they call Marxist-Leninist-Maoists, or "MLMs" for short. To give you the short-short version of what that means, each of those three guys had major writings about capitalism, socialism, and communism, and MLMs take a holistic approach to using those writings to formulate their ideology. If you think Antifa isn't taking their ideology from a monstrous regime, you don't know Antifa. You haven't talked to them. If you think they haven't taken chants from a monstrous ideology "It is our duty to fight for our freedom, it is our duty to win! We must love each other and protect each other! We have nothing to lose but our chains!" then you aren't familiar enough with communism to spot what they're doing. That is literally a quote from Marx's Communist Manifesto. Sure, it doesn't sound malicious in a vacuum, but neither does "blood and soil." They might not have adopted the Soviet uniforms, but they aren't Soviets. They're MLMs, so they dress in red and black with the hammer and sickle. That's the closest you can get to an ancom uniform.
I just can't agree with this. People have a right to speak, and anyone who wants to hear them has a right to hear them, and it's a strategically unsound move anyway. The more you try to silence them, the more compelling you're going to make them. Drag their ideas out into the harsh light of day instead. It's not like it's hard to do. You don't even need to throw them hardball questions. The very first time I heard Spencer speak in a softball interview, he was asked about his ethno-State, and how he was going to achieve it. He said he'd offer economic incentives to get non-whites to leave America. For anyone with even a passing knowledge of the history of Nazi Germany, you know that was like the third or fourth "solution" they tried. The majority of Americans aren't Nazis, and they won't support Nazi policies. All we have to do is point out the facts. If the alt-right didn't have so much sympathy from Antifa bashing peoples' skulls in, and the alt-right constantly being silenced, all it would take is a single instance of the curtain being pulled back to dispel what thin hope of majority support they might have had. I've done it before. Question a member of the alt-right enough, eventually they will admit that their ethno-State will require violence to enact. Interestingly enough, most commies I talk to defend their ideology as non-violent, right up until I tell them that Marx said the proletariat should make sure they are never disarmed, because they will need weapons for the revolution, and that Mao said all political power proceeds from the barrel of a gun, and Lenin said counter-revolutionaries have to be killed. Then they admit they're willing to resort to violence. Fascists and communists are both totalitarian demons that need to be opposed on whatever battleground we happen to find them in. Right now, the alt-right is to weak to fight, so they talk. It's perfect for us. Antifa, on the other hand...well, I'll just say I'm happy to see the cops cracking down on assholes who drag stragglers into crowds and beat the shit out of them.
One of the first things any self-defense instructor teaches is that you win every fight you don't participate in by default. Antifa have been the ones doing the majority of the escalation. It's not like the alt-right are the aggressors here. Otherwise, see my spiel just above.