The opinions in HK (which is not being censored) is widely divided also. It is not about the WHAT that they're asking, it is about HOW. If they are protesting peacefully, nobody would object - even the police. But then again, youthful protester would then claim that the only way that the government only listens when they use violence. The truth is, their voices were heard, it was just couldn't be agreed upon on. The younger generation's perspective in HK is like this - If I don't get what I ask for, you are not listening. Since you are not listening, I would do whatever it takes to make you listen to me, including breaking the law (destroying properties, set up fire in subway, beat up, lock up, surround or threaten people with different opinions). The enforcement is there to oppress me because they attempt to stop me from letting my voice be heard through breaking the law. Since they oppress me, I need to fight them back by throwing bricks, metals, slingshot, petrol bomb to them. Since they oppress me, their family deserve to die and their children deserved to be bullied at school.

THAT is how they think and what they are doing currently. Certainly not all of the protesters are like that, but none of the protesters are willing to tell them that these radical protesters doing / thinking is wrong.

That too can be manipulated. Peaceful protesters could be infiltrated with violence quite easily and the message gets automatically diluted into something like.. the protesters want violence, the protesters are bad

But the tweets and posts to support HK polices on Twitter/Facebook were deleted, how would you explain that?

Do you mean the recent tweet supporting the HK protesters? We know why that was deleted, because the Chinese government threatened the NBA. The NBA quickly caved, but it seems to have been too late: https://www.cnbc.com/2019/10/08/china-state-tv-suspends-nba-...