The problem is - as regards replacing nasty, terrorist-run anti-democratic regimes, with democratic, peace-loving, fair-minded, just, and civil Govts - America's record is pretty dismal, when it comes to wading into a foreign country in their best gung-ho manner, armed with the worlds finest cutting-edge armaments, and blasting away at everything that moves.
There's not a single country where any American attempt to install a democratic, Western-style, fair-minded and just Govt, has succeeded. In virtually every case, any country they have invaded has eventually returned to tribal militias, and gang warfare.