This stuff works for tabletop rpgs because it's a more controlled and freeform environment managed entirely by a GM for a few players at a time. Running an entire server off of rolling a dice (with absolutely no modifiers oh my god) is a very bad idea simply because there's no context to your rolls. A 1d20 attempt to gain an upper hand on your opponent makes no sense because it's literally random. I have absolutely no idea why you would replace the actual functioning combat mechanics of the game other than you guys don't want to bother fighting back.
Im fine if some one wants to Rebel and attack the character. The point is he did not Role-play it properly. With rolls and actions.
That's the problem I have with this sort of situation, in a sort of combat roleplay, a sneak attack would absolutely fail every time because you're calling out something that's meant to be an unavoidable attack. What you should do instead is perform actions with the already established game mechanics and form the roleplay around actions rather than pretending to perform actions. I guarantee this will make things more interesting.
Oh my feelings are hurt
Define good sever admins please. im sure with your stupidity you could explain it
A good server admin wouldn't have permanently banned upon first offense and would have taken the time and energy to at least correct your player(s) before discarding them. A good server admin would have taken precautions against being randomly attacked considering you're randomly throwing people into a jail cell for no clear reason and letting them have access to a weapon. There is no excuse to having something that does damage out in the open and still banning people for using it.
And don't bother telling me you have a strict set of rules, that's more stuff jargon for "I don't have the patience to actually make the server fun for anyone else besides me and my friends"