Fascinating footage.
Can I link it to mass and uncontrolled immigration?
I think I can.
No, you can't.
At least not in any coherent, logical or credible way.
In the same way that you can't reasonably link Tommy Robbinson, Vladimir Putin or Donald Trump etc. to a solution of your gripes.
Especially not Donald Trump because he actually stated that he will give the Police immunity from prosecution, when he is Fuehrer of the USAy.
Can you imagine what low-grade muppets like that plod would get up to with immunity from prosecution?
Especially when faced with an "auditor" who makes videos of how un/professionally Police react, to post them on the net (there are a few of them doing it now). The Manchester Police brass likely put a tag on his car so that he would get stopped and harassed, not realising that it would just put them in even more of a bad light.