I'm not familiar with all the facts, but wasn't he bought up in the UK?
I can understand the knee jerk reaction to wanting to send him back to Italy, indeed, perhaps that's what should be done - but there must have been a reason why the courts came to the decision they did...
He's not a Brit he's an Italian.
The reason they came to their decision was to
EU human right to a "family life".
Because they've kept him in the UK (in Prison)
for so long (>10 years) this has earned him the
"right" to stay due to his Italian father.
Edit: "Funnily" enough when they tried to deport
him before, the courts ruled it was too soon into
his sentence to do so. (6 years ago?)
I seem to remember his father was some kind
of enforcer in Italy who was convicted of an
acid attack on a woman and got sent down.
It's also alleged that the "gang" he belonged
to was involved in other brutal murders and rapes.