I think it's meant to be one time.
> Seems difficult to guarantee you don't kill a bunch of kids each button press cycle...
Seems extremely easy to guarantee that I don't kill a bunch of kids, just press blue. It's only the red-pressers who might end up murdering kids. By pressing blue the only person I am putting at risk is myself.
Even kids aren't entitled to murder innocent people because it's personally beneficial.
Thinking your kids will be ok after you tell them to become mass murderers is the psychotic bit.
There are exceptions. The closest is self defense (the use of reasonable force against the perpetrator of violence), it simply doesn't apply here because the people you are advocating for the murder of are not the perpetrators of any violence.
While we are talking about words having meaning, "suicide" has meaning, and it does not include "choosing not murdering people to avoid being murdered".