You often find expat communities have the exact opposite viewpoint as those that remain, part of the reason they are expats. See cuban expats, nicaraguan expats, not to say they are wrong but they are not a monolith representing all of a civilization. Presumably those standing around the bridges don’t want them bombed.

They're often from the families of the privileged or elites under the old, america friendly regime.

Indeed, the entitlement complex is probably why so many of them (in the iranian diaspora) were happy to rally behind an actual monarch.

This is not a normal thing to do for somebody who has supposedly adopted western values.