I think you can use your vote trying to prevent the pest, since fighting collera is easier. If you think there is no difference what so ever between having a right wing government (democrats) versus an authoritarian (republicans) I would argue that both parties dont care about average people, but with the right wing government in place you have It a bit easier fighting your battles in direct action etc. You bring positive change via Direct action and community building, with your vote you can influence the circumstances a little bit and how hard the fight will be. But There will be a fight no matter who is in charge. But do you want to play this on hard or nightmare mode?
First I wanted to fight your comment on German trains, but relative to the US you might see it that way. Let’s settle on there are trains. And they can in fact drive between cities.