I'm not sure this follows. I would find it hard to make a trail from Khan's identification "with those specific population groups based on his personal situation" resulting in "attacks by people who had been under surveillance".
It is my understanding that it wasn't Khan who cut police funding to the bone. That was Tory.
The criticism, which again you may disagree with but is legitimately justified, is...
1) that immigration policy, immigration investigations, law enforcement & intelligence have been pulled back. That is an absolute fact.
2) that in pulling back, threats slipped through and people died. That is also an absolute fact.
3) that the reason or a reason for the pull back was due to political-culture concerns that certain populations would feel unfairly targeted, mistreated, etc & that this would drive some in those communities to be vulnerable to radicalization, to be radicalized, and to lash out violently.
That is the position espoused publicly and at length by the Mayor among others. It is more the extent of his outspokenness and political prominence that make him a lightening rob for that criticism, and he did that to himself.
Mentioning that he's personally Muslim is not strictly relevant to the core criticism, which is fairly directed by the right against the left broadly.
However, it also is not irrelevant to question if his personal circumstance causes undue empathy towards those populations which motivates greater support of that accept casualties in order to not offend philosophy.
To draw a parallel, Trump was criticized for not being outspoken enough in his rejection of right wing extremists. If he'd gone even further and adopted policies that somehow freed them to operate. And if the nutjobs then killed a bunch of people as a result of that freedom... then it would not be fair to blame Trump for the attack, but it would be very fair to criticize him and his policies for contributing to the situation that allowed such an attack to happen.
Those sorts of criticisms happen a lot on both sides. And they really are fair reasonable statements. I'm not saying they're 100% accurate, but they're fair.
Labour of course responds blaming budget cuts.
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