"Islamisation of Britain"??
Where did that come from?

They were people who had been radicalised.
None claimed British racism as their motivation.
I have never heard a radicalised person give that as a reason.

You have tried and failed to make a case for "deeply racist" Britain many times.
It is not.
You can find so many reports on racism because we care about it so much.
Britain is a deeply tolerant and welcoming country.