Yeah it would be great if nobody agreed to commit any violence ever.
But until that point, it's nice to have some soldiers on our side who can liberate your country if the other side does decide to fight, or special forces to rescue you if you get kidnapped in a failed state by some people who decide to fight. And let's hope they're intelligent, disciplined, responsible and care about your life.
Do I support Europe or do I avoid getting my family killed by the German authorities for refusing to fight the other half?
War is ugly. Everyone refusing to fight is the only answer.