Iranians have a 5+ millennia culture of being highly educated, technical and creative.

That expertise wasn’t just gonna disappear in a couple of decades.

And yes, the Iranian regime is brutal and terrible. This was one time the opposition was strong enough that they may have had a chance and yet our fellow in chief decided to launch incendiary words, which only allowed the regime to paint the opposition as western funded, while not providing any actual support (there’s a reason Israel, which is at least led by competent leadership, kept quiet about the protests in Iran because they understand how their words of support would undermine them).