Why should MIL like or approve of her DIL?

Re: Why should MIL like or approve of her DIL?

I’m looking for the logical responses and less so the emotional ones. From a practical perspective, neither I, nor anyone else likes every person we come into contact with - that’s human nature. So then why the compulsion to like the DIL?

@ Hareem - decency is a relative - and it’s less a matter of doing the right thing and more an emotional reaction.
@ falafel - insaaniyat also demands that the son not displease his mother - if he didn’t care about his mom - does she still owe her DIL some consideration?