That does seem harsh.
They have a lot of users on there and a set of rules.... if you break the rules, the mods will take action with impunity.
It's pretty simple, don't break the rules and you won't get your wrists slapped.
The worst thing you can do is go off on a rant about it afterwards on the BBS or other forums that the mods on the BBS have access to
The best thing you can do is drop a Mod a PM and say, oops sorry I broke the rules, it was a genuine lapse of concentration on my part, it won't happen again.