The people in Iran have a right to express their opinion even if a country somewhere else would be willing to use their expressing their opinion as an excuse to bomb them.

USA bombing Iranians is USA’s fault, not the fault of Iranian protesters. And in extension, it is not the fault of people supporting the Iranian protesters. The Iranian leadership is full of shit.

The people in Iran have a right to express their opinion

That’s all well and good, but it doesn’t actually change the immutable law of cause and effect that was entirely obvious in this case. Doing something that will predictably lead to a bad outcome just because you wish it wouldn’t is still a terrible idea