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Or the Americans saw that the issue the rioters had come together on was in the rioters favor (I.e. the American gun owners agreed with the uprising), therefore at the time they saw no reason to intervene against those who had what they saw as a legitimate gripe against the establishment at the time.
I don't know how old you are, so it's likely you have no recollection of that (Watts) riot. But once it got going the destruction was massive and insanely brutal. Stores and shops were looted and burned, cars were overturned and burned, every White person those rioters encountered was brutally beaten. Here is video of just one such example:
This poor fellow was nearly killed by those raging monkeys. So I can't imagine that any civilized, law-abiding citizen could have harbored the slightest sympathy or solidarity with those rioters.
Trust me, if the issues turn against American gun owners who see that an assault is taking place against them by groups who are against them as being Americans, then look out.
Some will actively respond, but not nearly as many as you might think.
As stated above, by imposing an endless flow of repressive gun laws, registration and restrictions, the American law-enforcement establishment has stigmatized guns and successfully intimidated the majority of gun owners, most of whom are too inhibited to do what those Koreans did during the Watts riot in 1992. They're afraid they would be arrested if they fired on an approaching mob. And they probably are right!
If you live in a Western or some Southern states you will have cause to disagree with me. But if you live in New York, (especially) New Jersey, Connecticut and many other Northern states you would understand what I mean by repressive gun laws.