This question has multiple layers of thinking:
1. People who can't read pick randomly.
2. People who can read, but are too dumb to model or care about other people pick red.
3. People with enough intelligence for basic cognitive empathy pick blue.
4. People a little smarter and think through game theory overall pick red, and think they are smart for doing so.
5. People smarter than #4 and capable of seeing the big picture realize they don't want to leave people who choose #1 and #3 dead, so they pick blue.
6. People who realize the game theory optimal strategy is to announce you're pressing blue and convince everyone else to press blue, but privately press red.
There are probably more layers to this but the whole debate involves people getting upset at each other and accusing people of being in groups they are not. Red group #4 accuses blue group #5 of being #3 (not thinking beyond basic cognitive empathy). Blue group #5 accuses red group #4 of being group #2 (too dumb to model how others act). It's almost a perfect ragebait question.
As for which camp I am in, I am pressing blue and think you should too.