Something we should all already know, but I think many of us don’t…a fatwa is not binding on you. A mufti cannot make anything Halaal or Haraam; he can only tell you why he thinks something is Halaal or Haraam. That doesn’t mean his opinion makes it so.
You can accept his reasoning, or you can reject it; that is up to you.
Al-Hamdulillah, we do not have a clergy in Islam; there are no priests, no popes, no “representatives of God on earth”. We have scholars, and they possess knowledge, but not ownership of the Deen.
We are not Rafidhis who believe in the infallibility of their imams.
Your shaykh, or mullah, or mufti, or imam, can tell you the opinions of those before us about certain daleel, and he can tell you his view of the daleel and its ramifications; but, of course, he can be mistaken. So, bear this in mind.