So in our case ( I am talking about admin's role,or even in any player's case) I have to be a rulebreaker to catch a rulebreaker?
That's not how it works,not sometimes,but it never works like this,this situation could have been easily avoided if you simply hadn't teamed.
If anything,what you did is worse, because you knowingly broke the rules,just to catch another guy breaking the rules.
You're not doing a public service in this case,you're being just as bad as everyone else that breaks the rules.
"Being a thief to catch a thief" is not how this goes.
I mean,you already know the rules,but you decided to break them anyways,just for the sake of banning another player,risking the chances of you receiving a less/equally/more lengthed ban yourself.
It's like you went to the police to confess on someone committing murder for example,but you also tell them that you handed them the murder weapon,intrigued them on committing the action and also helped them get rid of the body.
It makes no sense,and it 100% doesn't make you the "Good Samaritan" is what I want to conclude from all of this.
I hope you avoid similar actions in the future,for your own good.
Respect the server rules,and play fair!