Usually, that's because the people are backed by another country with power like when the USA or Israel initiates its color revolutions on other countries to instill their puppets.

Truth enough, but they have a lot of valuable strategies that can be used.

Also, authoritarian regimes aren't the problem.

I never said anything about whether they were or not. I said that regimes can end even when they don't allow for free elections, and authoritarian regimes don't.