"Let's bring back the assault weapons ban" is in no way a "dogwhistle".
Gun control measures have pretty consistent bipartisan appeal, as already handwaved by you. There's no indication Harris' support for an assault weapons ban will be a negative factor, here.Can we genuinely believe that we would have more people showing up to vote Democrat in this case, than would show up to vote Republican? Because I find that really hard to believe - most people voting Democrat were *already* going to do so because the other option is fucking Trump.
And again; your entire position is just doomerism to block any progress. It isn't a rational position and is not productive involvement. At best, this is a messaging/framing issue. Nobody likes school shootings or gun crime. Trump's cowering behind bulletproof glass at every rally now. Even Republicans have good reason to think maybe gun control is a good idea, now that it's clear the bullets won't entirely be focused on Democrats.