Nobody said abusive and violent people should be tolerated floo; if you read back people have said quite the opposite.
What we are talking about is UK citizens, like ourselves. If they commit a crime (& aif they're caught of course), they will be duly punished, that is what prisons are for, but they cannot be deported anywhere. The days of transportation are over.
Not conforming to 'our' culture, whatever that may be, is not a crime and in a tolerant society we will accept differences - sometimes even celebrate them.
A different scenario would be if a person from another country, without UKcitizenship rights, commits a crime here. For example a person from, say, Brazil or Russia, who is here for a month or two. They would be deported, i don't know how it works, they'd likely be remanded here first but eventually packed off.