You're probably right about that... my theoretical virus spreading lunatic would more likely be a disgruntled Bernie Sanders supporter. You should have seen how bitter and rage filled their Dank Meme Facebook group got after he lost the nomination. They're ready to watch the world burn now.
possibly--also remember that it was revealed that a vast array of those "Bernie Bros" from 2016--the angry, "Never Hillary, might as well support Trump" types--were actually posting from the same troll farm in St Petersberg that was responsible for the very same insane pro Trump, anti-Hillary facebook messaging. ...Yes, that is an absolute fact.
So, I agree there are going to be crazies within all of these groups, but it's important to remember that what we absolutely know to be true is that the craziest of all of that meme messaging comes from the very same troll group, and it was part of a very organized messaging plan. It shouldn't be shocking, either, as the Russian Trump trolls and Bernie trolls pretty much used the exact same arguments, same syntax, same everything. Their "grievances" were always the same.
And yes, those pretty much represent all of what we think about "Bernie Bros" when we hear that term.