I watched the guy catch on fire! He did go to a local hospital! Not sure where you are getting your news.
Police are severely undermanned. They have beaten people when they were resisting arrest or interfering with an arrest. Not sure what you thought you saw.
I am generally a big fan of Fox News, but even they have been extremely biased in favor of the protesters. You should see the damage the protesters have done in person. You should see how they bully people - anyone that disagrees with them and in some cases, even people they THINK might disagree with them. For example, people from mainland China are a common target of the protesters.
You should see the pervasive damage the protesters have done all around HK. It is simply incredible! In just one of the university confrontations, the police finally won out and discovered 8,000 glass bottles the protesters had for making Molotov cocktails (something the protesters seem to love to throw). The protesters have used Molotov cocktails to attack the police. In some cases, they have caused some policemen to catch on fire as a result. Fortunately, their fellow policemen helped put out the fires quickly.
Regarding the booksellers - yes, that was a big mistake of the Chinese government. That was commonly quoted as the reason Hong Kongers would not accept the extradition treaty being considered by the HK government. It did get fully withdrawn.
I am not aware of any promise to not interfere. There is the Basic Law in place allowing for HK to rule itself, but it also allows for Chinese oversight. Thus, for example, under the British, HK’ers did not have the right to vote. Now, they have the right to vote, but all of their politicians or those running for political office, must be approved by the Chinese government. HK’ers really want a system more like ours, but it is unlikely they will ever get it. This is one of their current (and prior protest) demands.
Regarding my views, I am a diehard Republican. Have never voted for any person of any other party, and sincerely doubt I ever would.
The difference here is that I have seen up close and personal what has actually happened in HK. I have no agenda for them other than safety - which includes law and order, and not chaos. I don’t really care what form of government they have, or eventually have. I have seen what it is like in mainland China many times and in many cities. I have seen what HK was like before the protests and now with them. I could not wish such agony and frustration on any country, regardless of their form of government. That is where I differ from many people in the USA.