Only preventable if we didn't get ourselves a reputation as a soft touch country.
How long did it take to do anything about the hook handed preacher spouting hatred for years on end.
Were too reactive rather than proactive.
I doubt these people went straight from example citizens to killing in the street. But not until after the sh*t hit the fan did anyone start asking questions. Probably to afraid of being branded racist to do anything. Just like the Rotherham child abuse cases. To afraid of the PC rule to say or do anything before its too late.
it's not a case of being too afraid more of being hamstrung by the law. We tried to deport Abdul Hamza (you could have googled it) but were prevented from doing so by the ECHR. Racism has nothing to do with it.