No, only admin should have to right to ban.
The problem with giving donators access to the ban commands is the same with giving a normal player access to a ban command:
It hurts to say, but people will most likely abuse that. Even if the community is nice, like here, there will always be player(s) who will abuse that they can ban people.
Imagine if someone with his 15+ friends play on our server, and some random guy joins, but they want to play alone. So they ban him.
One might now say: "But people can report false bans and punish the player(s) who did it".
Yes. We could. But that would mean extra work. Any why give us extra work, if you guys can just report him on the forum? That way we don't have to do the work of finding out whether the ban was right or wrong. We just have to look at the "evidence" and then decide if it's enough to ban someone or not.
Other problems are the lenghts of the ban. Should someone who spammed 3 times the same be banned as long as the one who haressed other players 3 hours long? There could be an option for the donator to choose the lenght, but most would only just choose the maximum.
Just get some screenshots, maybe even record a video and post it here. It's not that hard.
There is a reason why only admins have access to the ban command. Because we were trusted enough to handle the responsibility. Because our judgement of when someone should be banned is (mostly) correct.
We had the same discussion back in the old Operation-Panda Community, and it ended with not giving donators the ban command.
But I have to ask here: Do you guys have access to the kick command? And is there an automatic ban after 3 kicks?