No definitely not.
A long time ago, in the medieval ages, they had some concept called a “just war”.
It meant a situation where you had to fight someone, but had to do so in a “right way”. For example, consider a duel: You have to talk to your opponent first, introduce yourself, state the reason why you’re having qualms with them, give them an option to find non-violent ways to resolve the conflict, and only if that fails, you start the physical fighting. After the opponent is defeated (for example by giving up), fighting had to stop and the matter had to be considered settled. it was not acceptable to blindside an opponent, play dirty, like attacking them from behind. and stuff like that.
something similar applied to larger battles as well, btw.
Why would it be wrong? You choose your own path in life.