Again, unless you are advocating staying in the country indefinitely, how should that have been handled? I'm not actually giving in an opinion here I might add, I'm asking how someone can have a definitive opinion on the success or otherwise of the exit from such a complex chaotic situation?
No, they just needed to stay until the country was more stabilised. Too much corruption meant the army weren't being paid so no wonder they buckled.
Also, use West Germany as an example. They were there for 45 years before the Berlin wall came down.