To answer this question seriously, if people stop arguing and paying so much attention to the worst voices (which, in truth, require specific effort on our parts to even find) then they'll realize they're often pulling the rope in the same direction more often than not, especially if the issues/work is local and not explicitly political.
You can, locally, feed the homeless, read books to elementary school kids, deliver meals on wheels, etc... with people whose political views you abhor and not even know it unless you make it a point to try and find out. (Or were incapable of ignoring/shooting down their overtures to start political conversations.)
Even in the world of volunteering pro bono for illegal immigrants, who would you even talk to that would respond that way and what would it matter? I know millions of Americans who would be mad at you, but at what point would that conversation even really happen?
Someone asked either here or in another thread why do Democrats need to be the bigger person or the adult in the room or whatever... it's because there's no other option. Not in some dramatic martyrdom way in which we nobles are holding up the pillars of society, but there's just not another option if we are in charge of our own values.
So I can do whatever the fuck I want because it doesn't matter how many people believe my specific efforts are making the world worse. Their opinion has zero power or relevance that I do not purposefully and intentionally give away.