I think Sir Alex was also part of the problems that befell Manchester United when he resigned. News then had it that he was the man that handpicked his successor which was David Moyes. That was the genesis of Manchester United problems, an inexperienced coach handling a team like Manchester United at that time, this was a title winning team that was handed over to him.
I totally agree with you on this, even in history, it mostly doesn't end well when an outgoing person handpicks his successor. I once read an article about Ferguson picking Moyes. How could he pick an inexperienced coach to manage a team like that. Moyes has been coaching Everton for almost a decade if not more and ends up mid table, how on earth did he think such a man was suitable for the Manchester United job back then! So I agree with you when you said Ferguson was part of the problem.
Yeah you people are right Sir Alex Ferguson was part of the problem because of the hand picking he did, when choosing a coach you should pick someone that has done very well in his former club not picking someone you know didn't perform well in his former club is very wrong and will only destroy the club, just like what Bayern Leverkusen did right now by picking ten Hag knowing fully well that he didn't do very well in Manchester United are they expecting a miracle to happen now that they have signed him, well let see how it goes.
Sir Alex Ferguson was a great coach and so Manchester United trusted him to be able to pick the right coach that will succeed him but he did not pick by merit but he did it by relationship and that was one of the things that led Manchester United to this state it is the date.
When giving an opportunity or trusted with something you need to leave favoritism out of the way if not you will make the wrong decisions.
What has happened has happened Manchester United can still come back to life if they do the right thing.