In general, he's a good leader but regarding Hong Kong, the end goal is to bring the country under China so he's doing the right thing for his country. For the people of HK, that's not what they want.
It's up to HK to decide to do with their freedom instead of being ruled under mainland of China. Both HK and China fought so long.
Same thing applied to Taiwan. They used to be Chinese but fled far south to create their own country. Even nowaday Taiwanese still defending their country with military warfare from being overtaken by mainland.