BBC went through that last part this morning. The decision to allow him to stay was correct, no error, based on our current immigration laws and the human rights convention.
Personally I see convictions for violence or ‘lesser’ sexual assault as a major red flag, I’d rather a harsher regime...
Sadly typical violence against women and kids. Especially where the woman moves on. As old as the hills.
Too much micro analysis above imho about race, poverty etc. Middle class white men also murder/damage their ex partners.
Perpetrators, depending on the substance and damage, should get whole life tariffs. Because they've ended a life in many ways, often intending to do so.