In France, you cannot talk or say anything bad or dissident against Muslims and Islam or you'll get mugged, attacked, harassed or beheaded in the name of prophet Mohammad. In the UK, you cannot say that Muslims are the main problem behind the myriad of sexual assaults and crimes in the country or you'll be branded as a racist bigot and the police will put you to the slammer. In the USA, say anything that shows pride of being white and an American makes you a fascist. In Germany, anything that's right-wing in opinion is illegal and can get you to jail. In Sweden, talk about how the Muslims have destroyed your country inside and outside and your fate is worse than those who raped or murdered.
Have you Westerners lost your will to fight to preserve yourselves? Are really this desentized to the point that you're more worried about what the media will have to say against you if you stand up for yourself and your right to exist? Maybe it's cowardice.
To anyone interested in this topic, I'd recommend The Strange Death of Europe, and The Madness of Crowds by Douglas Murray. Alternatively, search for his name on YouTube and pick whoever your favourite interviewer is.
On topic: It's a myriad of things.
One of which I've heard of recently calls the ultra-progressive social justice movement a "Luxury Belief System". Instead of showing how well off you are by buying an expensive car, or living in an upper class neighbourhood, your signal your high status via your (political) beliefs.
Another is the idea of Biological Leninism. To paraphrase, the far-left panders to all the degenerates and (previously) low status people in society, and becomes the only group offering them social status. This creates the staunchest of allies, as they know that if they stop supporting the cause, they'll lose all their ill-gotten social status.
The third idea I'll offer is the idea of a God-Shaped Hole. In the absence of a religion which they believe strongly in, people with lesser convictions (to phrase it politely) are more likely to fall for the cult tactics that the more radical and extremist left utilises.
The most interesting facet of this situation is the role that ubiquitous social media has played in propagating these ideas. Everything you say is being judged. The posts you like and the people you follow must pass muster with your peers. When the mob gathers, you need to chant the correct words at the correct times, or they'll turn on you next.
And the scariest thing is, you will be bullied by people who don't believe in truth, logic, or facts. They unironically believe that people's feelings and emotions matter, and that objective truth is just a tool used to oppress the underprivileged.
How do you reason with these kind of people?