The people who control the resources control the armed forces or paramilitary forces.

Plus, if there’s a popular revolt, they are usually motivated by religious, ethnic or ideological factors. Status quo is the interest of the big powers. That tends to bring direct or advisory intervention by western military forces.

I’d suggest spending a few minutes googling, you’ll learn alot.

And as has been demonstrated, popular revolts tend to leave a power vacuum that gets filled by just another abusive regime.