On my point of view, no "bad" players play on the server and I personally think you used the wrong word to describe certain people.
Everybody plays the way he wants and he's free to do that.
I think that everybody in the server is a good person, who has his own way to play on the server.
So you can't say "bad players" screwed me.
You have to say that a part of the fault is also yours.
Since PvP, griefing and raiding are allowed they became automaticly part of the game fun.
I think you need to take a step back before jumping ahead in this "on the spot" decision to leave the server because it is never good when a familiar face leaves.
I'm not saying its your fault, I say you should be a little bit more carefull about the players you put trust in.
Take this as a life lection, try to avoid "less known people", and trust who you really know, this way the chanche to be griefed, or screwed in real life declines.
So you can't say that a player who griefes is a "bad player", he just plays in a "more actionfull" way, wich you might disagree with... but this is a server so you have to deal with it.
I took my time to write you this because I know you are a good player and I don't want to not see you anymore and as you can see I'm not the only one who doesn't want you to leave.
I'm aure you'll ponder on this and you'll eventually make a decision.
(This is just my opinion)
Hope to see you playing.
Halo