Something so "trivial" as stealing isn't as trivial as you make it out to be. When I first joined the server yesterday, you were indeed online and playing in the server. Apparently, since I changed my Steam name, you weren't aware of who I was. I was in spectator the entire time I was in-game, just because I got reports saying that you were stealing/attempting to steal other player's rockets.
You attempted to steal many rockets, and even though a majority of them weren't successful steals, the fact remains that you tried. You do this whenever you know that an Admin isn't online, or whenever you think one isn't in the server. This, I know for a fact seeing as how you've stated that you're guilty of such crimes here on this thread and on the server before. You've also stated that not stealing "takes away the fun" whenever I've joined before, which honestly, makes me quite upset on a personal level. However, I cast that aside.
I slayed you once yesterday, and you decided to stay near the back of the map as not to steal again. About two minutes after your initial slay, (which should have been more than one, had I slain you for attempting to steal) you decided to disconnect from the server. However, I can 100% promise you that as soon as I left, you would have begun to steal again.
The reason that you were banned while you were "offline" was because you disconnected before I was able to ban you via in-game comm controls. So, it wasn't because you were offline that I banned you, or some personal grudge as you may think/claim it to be. You were banned while you were offline because I literally had no other way to ban you aside from a web ban.
Honestly, I don't see why you continue to break the rules and expect to not face punishment for it. I get complaints all the time from friends on Steam that I know I can trust who claim that you're stealing, and honestly, when I get the same report from multiple different people who have no association with each other whatsoever, that says something to me.
Just follow the rules; then this won't have to happen again. Rules aren't there to be broken; they are meant to be followed.