I'm not going to argue whether or not anything you've said is untrue, but you're leaving out some pretty important details which puts the protesters in a worse light.

First of all, one of the initial demands of the protest was to retract the characterization of one of the earlier protests as a riot. So even peaceful demonstrations have been cracked down on by the government. Even well-organized protests such as the one on July 1st (the anniversary of Hong Kong being handed over to China - there's usually protesting on this date) have met with strong resistance - early on the police were ordering people to disperse even though there was no violence at that time.

Secondly, late in July there were increasing attacks on protesters in which police stood by as people were attacked with poles. It seems that in this case, it was the police that were allowing violence and destruction, not the protesters.

Most importantly, the first bullet even fired in this whole situation was a police officer shooting an 18 year old high school student.

And regardless how the protesters are behaving, the argument that the only valid form of protest is peaceful protest is also historically inaccurate. Peaceful protest is definitely better when possible, but in many cases throughout history it simply has not been feasible.