Push the red one
You have a vague sense of unease when you consider pressing the red button. It's as if every sci-fi story you've ever read about time travel is whispering an urgent warning in your ear. On the other hand, you'll never know what happens when you press the button if you don't press it.
Do you?
Press the red button with authority, like you know what you're doing
Press the red button meekly, hoping that will mitigate the really bad effects