Why? Panama was a dictatorship ruled by a drugs lord in the 1980s. It's now a democratic country with competitive elections and orderly rotations of power.
You know, you’re right and I totally missed the point.
If we want to assess the chances of a US intervention in Latin America producing good results, we should probably include the results of Operation Condor in our analysis.
I would not say that Venezuela is currently having orderly rotations of power. Since the 2015 parliamentary elections, we've seen at least one constitutional crisis and the most recent election results are disputed.
I do not particularly think it's a good idea for the US to invade in order to overthrow Maduro, but I don't want to pretend he's more ethical than he appears to be.
It probably is, but why should anybody in America care? All intervention will do is drive America's international reputation even further negative, and probably cause a new wave of refugees (and people opportunistically claiming to be refugees) into America.