Now when we are against them and asking for our rights they are doing this for us.
no need to ask, take your rights
but don't expect people to respect you if you believe you have a right to destroy their possessions.
be very careful which direction you point your moral compass, especially when you have this very tense situation
to win, you must keep other Hong Kongers who do not protest on your side. Chinese/HK gov know that's powerful. They will try to get the non-protesting people to dislike you, which is why you must be so careful.
To win, there should be a break in the chain of command from the other side, and convince that broken part of the other side to join your side. Divide and conquer.
Protests should be peaceful, and non-violent. If the other side uses violence, let them, and show the world. Don't fight back. The non-protestors will gather behind for support.