Hindsight is always a wonderful thing. The Taliban were created or at the very least heavily supported by the CIA. Iran is a result of US interference in the ruling of the country. The West are funding Ukraine in a big way, and yet we were critical of certain practises very recently. Ukraine in turn are supplying weapons to Russian revolutionaries.
It is easy to be critical after the smoke is cleared. The reality is that if you arm and train a group then they become a weapon. You only have good faith that this weapon will not be turned on yourself.