The only reason to pick blue is to try to do the "morally correct" thing to "save" the other people who picked blue.

If you're the first person in line to vote, picking blue is neither logical nor moral. There are no other blue choosers who you need to support. "But there will be people who vote after me" well that's their decision to make. "People will vote randomly" okay well if they can't take living or dying seriously, that's kind of on them. Choosing the zero risk option when everyone else has the exact same zero risk option isn't selfish.

It's not selfish to choose red because everyone else has the choice to choose red. There's an unknowable risk with choosing blue. Choosing red only exposes blue choosers to the exact risk they decided to take.

Reframe it to eliminate the silly savior complex and it sounds ridiculous:

There's an infinitely long trolley track. You can let the trolley continue down the track, or you can divert it in your direction. You might get smooshed by the trolley by diverting it, but at least someone standing further down the track won't divert it and smoosh themselves.