Rape gangs are predominantly Pakistani.
Pakistan is a Commonwealth country.
Legal immigrants from Commonwealth countries can vote almost immediately in UK elections.
About 7% of the UK population is Muslim, about the margin of victory of the Labour Party.
Almost all Muslims vote for Labour.
Import more Muslims from Commonwealth countries like Pakistan -- cha-ching, lock in Labour Party power.
Piss them off by talking about rape gangs, and lose Labour Party votes.
Of course Keir Starmer never talks about rape gangs.
Of course he wants to import more Muslim immigrants.
It's how he and his party stays in power.