As a broadly disinterested outsider this whole debacle seems to be a matter of six of one and half a dozen of the other (as my mother always used to say).
Whether it was due to a glitch over which you had no control or not, attacking and destroying ships which it must have been fairly clear their owners believed to be safely docked at their home base is not a particularly nice or friendly thing to do
SuperWookie. Starmade is still an alpha so of course it will have bugs, but exploiting them against other players is poor gamesmanship.
That said,
MikeSheen, you do come across as rather heavy handed and intolerant (including on your own forums).
This is prior to any suggestion of attempts to hack into the server.
As to the hack attempt itself, if Rabidbat did indeed ask a friend to try and hack your server, then of course you have every right to ban them (and possibly contemplate legal action, not sure how the law works down in Aus). Of course I have to say 'if Rabidbat did indeed' as I have nothing other than your word on that matter. Nonetheless, this sequence of events:
When your mate Rabid employed a hacker to try and compromise my server - that's when I stepped in and banned you all.
is not the one that appears to be backed up by the posts on your own forum. The sequence of events that is supported by your own forum appears to be that SuperWookie, Rabid and Shout3236 were banned prior to your discovery of the hack attempt. I must also say that, while it may indeed be the case that someone who is a apparently a relatively well known hacker (and evidently good at it) may have attempted, and failed, to hack into your server, and also neglected to cover his tracks, it does seem just a wee bit unlikely.