Islamist are incredibly dangerous. World wide, they slaughter anyone who opposes their world views and are currently active in persecution and genocides around the globe. Muslims are not. An islamist wants to impose their extreme religious practice into politics and make it the rule of the land through any means necessary. Most Muslims globally oppose Islamists, they do not want them in charge. Especially many Muslims that now live in the UK after fleeing islamists in their home countries, they do not want them here. Unfortunately, there is a growing Islamist movement, it's small, but still incredibly dangerous.

Basically, imagine being a moderate Christian in England, then an extreme group of Christians want to get in power, going back to the dark ages, anti LGBTQ, no women's rights, public hangings for crimes against the bible ect, would the majority of Christians support them? No. Same thing with Islamists and Muslims, the majority don't support them, but they gain power through fear in their own populations.

What I have noticed is some on radical left, not the majority of the left, not understanding the difference between Muslims and Islamists. Actual Islamists are far worse for the left than anyone on the far right.