Because they have donated doesn't mean they are innocent. You would be surprised how many donators get banned for hacking..
I understand that donators have hacked and been banned in the past before, but regardless. This is a Minecraft plugin, it is not a flawless contraption, it is not some inerrant and immaculate "hacker-fighting" machine, it is bound to make an error sooner or later, is it not? I understand that a large case of the users banned from it are hackers, but if I understand you correctly you're saying this contraption never makes a single mistake and every single user banned is ALWAYS a hacker?
I'm not going to continue further with this whole debate, but just understand that it's a anticheat plugin and anticheat plugins will make mistakes.