If you haven't been following the protests closely, here's a quick summary of the situation:
The British returned Hong Kong to China in 1997 after the end of a 99-year lease signed during the Opium Wars.
Hong Kong operates autonomously from China as part of a deal made during the handover, but the system of government is essentially rigged in Beijing's favor. Because of this, protesters are demanding a true democracy and the right to vote for their leaders.
The extradition bill sparked fears that China would use it to exert control over Hong Kong instead of respecting their autonomy.
The police response to the protests has been widely criticized for being overly violent and abusive.
Support for Hong Kong is one of the few things Republicans and Democrats can agree on these days. The Senate and House sent a veto-proof bill to President Trump requiring the government to sanction the people responsible for the abuses in Hong Kong. Here's how Senate Minority Leader Chuck Schumer put it:
“We have sent a message to President Xi: Your suppression of freedom, whether in Hong Kong, in northwest China or anywhere else, will not stand,” Senator Chuck Schumer of New York, the top Democrat in the Senate, said on Tuesday evening. “You cannot be a great leader and you cannot be a great country when you oppose freedom, when you are so brutal to the people of Hong Kong, young and old, who are protesting.”
The main criticism leveled against protests in Hong Kong is that they've become too violent. Protesters literally set someone on fire. Footage from the incident shows the man fighting and arguing with protesters before a group splashes liquid onto him and sets him ablaze. The incident came as tensions were at an all-time high after a police officer shot a protester earlier in the day.
While many may have sympathized with protesters in the beginning, the increasingly violent and disruptive actions have gone too far.