Nonsense.
WW2 is a historical fact.
Powell’s ‘Civil war’ and ‘wielding the whip hand’ never happened.
The vast majority, by millions, of immigrants in the UK live peaceably, obey the laws, strive for a better life for them and their families, contribute to the betterment of the nation.
If of course you don’t get to look around the UK and witness that, you could sit in front of a computer screen at the other side of the world and watch videos of the tiny minority of immigrants who engage in violence, law breaking and the even smaller number who engage in terrorism.
A rational person would look at the relative numbers, see the millions of peaceful law abiding immigrants and not claim the tiny minority to be representative of the whole.
I do though accept, if your only view is through videos someone else fed you, then you might develop a biased view that in no way reflects the overwhelming reality.
Go to the UK, look for yourself, you might just be pleasantly surprised.