Because these people believed US and Israeli propaganda. US achieved their objective of portraying defeat of Iran, capitulation of China, betrayal of China to Iran, win of US. Haven't people learnt anything from the past years of Trump propaganda?
Don't people have any memory of Biden's trick of Russia and China about Ukrain? China is part of it, so China is as evil as Russia. Whenever there is a pause of China's shipment of oil from Russia, it must be China capitulated to Biden's pressure and betrayed Russia. What do we see now?
Don't people have any memory of Obama's trick of NK/China? It goes like China owns NK therefor China must have pressed NK for anything that US "won", China must had obeyed to US order, China must have betrayed NK. What do we see now? NK's FM is soon to meet Wang Yi. China's FM spokeperson referred to western reporter's "NK missile" as "flying object".
It is a simple and CHILDISH trick. Even if it is difficult for someone to comprehend shouldn't people at least have a memory long enough to remember what just happened since 2020?
Ultimately, there has to be some sort of resolution to the nuclear enrichment issue. Other issues can be negotiated, but the fundamental, nonreconciliable existential threat posed by Israel and Iran to each other can only be guaranteed with mutual nuclear deterrence.
My understanding is that all parties know implicitly that a nuclear attack on Iran by Israel would be blocked by a formal Pakistan nuclear umbrella pact with Iran. Well what if the US also joins in, then who would be there to back up Pakistan? China, of course. And there is already a prior example of this, the recent 2025 Saudi-Pakistan defence pact.
I would venture that is the only reassurance that China could have provided Iran to insist on starting negotiations with the US.