Many Hongkongers were taught to look down the mainland and they are not proud of their own country. If you read more of the history of how different acts were withdrawn since 1997, you will see whatever the local government did, they do not agree - for the sake of being proud of disagreeing "mainland ruled" government :-) They probably do not necessarily worry about their life because most of them spent their parents' money. So they spend time to ruin the place they live in to pursue the spirit what was taught.
The economical decreasing, which was assumed to be one of the reasons of the protests, seems actually caused by the attitude. Namely if a person always wants to find a way to be against his manager (politically), is he capable of developing his own benefit in a company (economically)? I doubt.
I have to say, this is a smart move of anti-mainland (or anti-CCP) people to leverage these brainwashed young puppets and lead the movement. But it is meanwhile not so smart that everyone who can read Chinese knows who's really leading it. To be honest, this movement is really nothing to mainland if you understood the history in the past 70 years how the country was managed to develop.
And yes, looking into the media in both sides would be a good thing to mitigate the bias.
Besides, "the truth and the whole truth" is a joke, don't be depressed :-)