It depends on the dictator.
Mostly, I think when we interfere in regime change we screw it up. The screw up can be anything from more people suffering and dying to putting in a leader who in the end is worse for the country and the US.
At the same time, I’m glad we did something about Hitler, I wish we had done something sooner than we did. I think Hitler would not have been defeated without US participation.
Cubans today still are angry we made a deal with Castro. That’s how they look at it. Many Cuban-Americans are Republicans, because they feel Kennedy didn’t go in and get rid of Castro. I’m not going to go into the Cuban situation in detail, but let’s just say in all cases of civil unrest within a country, and dictatorship, the situation of course is always much more complicated than it seems.
I’m not in favor of a zero interference policy, nor am I in favor of jumping in to every situation, but I do think the US tends to interfere too often when they/we probably shouldn’t.
The biggest problem is probably that we sometimes interfere for the wrong reasons, and without being realistic about long term consequences. I think we consistently fail to consider the country before the dictator and the attitudes of the people.