@ Samson
I am sceptical of many crime statistics.
In many instances crime is not reported and even if it is, the identity
(and therefore immigration status) of the criminals is often unknown.
I suspect that there other reasons why there has been a crime drop
in some categories. I will give you some examples of my guesses why.
(1) The cheap availability of new goods, via Shein and Temu etc, means there is less
benefit in burgling and competing with charity shops etc, to sell stolen goods.
(2) A failure to prosecute rape means there is less incentive for it to be reported.
(3) Many younger people adopt a policy of not carrying cash, so pick pocketing
and mugging are less attractive.
(4) Roll out of CCTV and facial recognition may be having some impact at crime hot spots.
I could go on.
Anyway I won't pretend to have quantitative evidence to support my guesses.