The bottom line is the government doesn't care about you or what you think. There could be a handful of people who vote for those two people that you mentioned and they're not going to give one fuck. You really think that sends a message to the govt? They don't give a shit. They see that and they're like "lol what a bunch of peasants". It's like I said a cup of water vs. house fire. There is no "but at least you did something, at least you fought back" because that one vote goes right into the trash once voting is done and is forgotten about. They're not going to care that there was a few people who voted for a different party other than demo. or repub. Look how long it has been going on. For years people have been voting for independent and other third parties and has anything changed? No. It still comes down to red vs. blue and it will always be like that until some other revolution comes about in the future.
Plus not voting makes me feel like I'm actually doing more for my country rather than contributing to Trump or Hillary. It's like giving a suicidal person a weapon to kill himself in a more efficient way. I'd say more Bernie supporters are more likely not to bother voting because Hillary and Trump were both anti Bernie. Hanging your head down and giving up to them, to me, sounds like being a slave to the system, shackles and all. Not voting sounds more like fighting system. If the govt actually cares about the votes like you seem to imply then the less votes they see coming in the more they will think that people hate the two party system and it's candidates and in turn maybe a change will eventually come about to get those people to vote again.