To be honest, things went down the drain when they started to target the airport and the MTR. Not to forget they use bully tactics when you disagree with them, forcing you to join their strike by disrupting your means of transportation and now destroying the MTR station. They cut the wires of traffic lights, MTRs, throw stuff at tracks while the train is running etc at a complete disregard of the innocent people on the train or driving.
The situation is made even more messy when the media cut off the parts or gloss over the parts where the protesters themselves use violence. We see some of these caught on video, so it is hard to support the protesters as time goes by. Most of the people are angry at both sides though, a weak and useless CE and at the same time the violent protesters. You dare not speak up in fear of official prosecution or public bully if you stand on either side. So much for freedom.
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Tiananmen was a different case as there are people trying a coup while using the students as their meat shield. It comes down to the line of whether the government rule will fall, and in the case of Hong Kong, it is not that serious since it will not affect CCP's rule in China. Heck, the central government itself is trying to cool down its people from not hating the Hong Kong people, which is failing since many thinks CCP give too much good stuff to Hong Kong, making them believe they are superior to them.