I don't have a problem with anyone changing their mind, if it's done for the right reasons - e.g. changes of circumstance, new information comes to light.
Far worse, would be someone with such closed a mindset as to be unable to recognise that their initial decision is now no longer the correct...
That's a bit like the folk on here that cry "<Manager's name> OUT !" when we have a couple of bad results.
I'd respond to your statement above in the same way - Show me the other better candidates ready to step in and do it. Perhaps Alan Sugar could do a job?
Everyone want's to claim that...