^But i asked you, do you know why the prophet became angry?
What if the hadith is authentic?
That's my point, hadiths like these which are generally considered authentic, have been the cause of people leaving Islam.
Do I know why he got angry, probably because she was spying on him, why did he hit her, God knows, how hard did he hit her, God knows, is this even authentic, God knows.
Aisha followed him, because she thought he would sneak to his other wives and it doesn't suit a prophet to cheat. That's why he asked 'Did you think that Allah and His Apostle would deal unjustly with you?'
The hadith scholars have set up a good system which enables them to research if a hadith is authentic or weak. Bare in mind that the muslims were the first to write down an accurate and critic biography wherein everyones short cmonings are mentioned. One have to fulfil some requirements in order to accept his narrations.
Without hadith we wouldn't be able to know how to pray, so if you accept one why do you reject the other?
As for the ones that left the islam, i think they will find always an excuse.