Re: First Cousin Marriges...
I am yet to come across something that states marrying your cousin is permitted but not recommended. Or that it's prefered that you don't marry into the family. All your examples below make sense and mostly because Prophet PBUH avoided those himself and for a good reason. However, when the biggest example of humankind, Prophet PBUH himself married his own relative, do we really have a valid argument here? Bibi Aisha RA was his most beloved wife- have you ever read a hadith stating that he married his relative but would not recommend any Muslim following it?
For me, theory is that if our beloved Prophet did it and was happy, then it's all valid and logical- I don't question anything beyond that.
We are allowed to eat beef,lamb etc, Prophet him self avoided beef(red meat). He preferred less dense meat always. Meat wasn't his fav. We are allowed to divorce. But are those practices recommended ?????? answer is NOOOOOOOO
THERE IS A DIFFERENT BETWEEN BEING ALLOWED and being desirable. I believe there is no "law" againest cousin marriages, but its not seen as best practice as well.