You want to talk about rights?  Let's talk about the First Amendment.  I feel pretty comfortable in saying that free speech is threatened (literally) when people show up with handguns, AR-15s, etc.

These selfish bastards obviously showed up armed with the intent to intimidate.  And intimidate it did.

But that's not an argument against gun control; that's an argument for it.  That's what guns are NOT to be used for.