Don't really want to get involved in this, but, pritty much every empire/nation in the history of our species has had/dealt in slavery. We were no different, and I'm sure it still goes on today in the developing nations, Would it be fair to argue that no other nation has done as much as the UK to end slavery?
If someone wants to deny the holocaust, then they should, but should be treated like the idiot that they are, they're on par with flat earther's and young earth creationists.
This thread seems to be more, I can't believe someone with the same political leanings as me has been cancelled as opposed to cancel culture is stupid (which it is).