If you assume it literally, you have to take into account you'll have millions of disabled people and children accidentally hitting blue. In this case, hitting blue is obviously the moral option.
If you assume all actors understand the prompt and are adults of sound mind, red is the only choice. But only if it was a limited number of actors.
Edit: In a real world scenario, you would have to understand that people are scared and dumb. What would happen is something like 20% will hit blue and die. The world would enter a huge depression, food would become scarce and society would collapse.
The sudden shock of collapse would kill a huge number of people. Let's say 50% of the remaining population. This leaves you with a 40% chance of survival, hitting red. (Hitting blue in this case is 0% survival).