“Now why do I have to back up my claim?”
you don’t its a free country and a free platform.
however you do often (very often) advertise yourself as some sort of expert, as if your pronouncements carry weight. To be taken seriously you meed to be able to backup your pronouncements. when you say “HCQ is a recommended Tx. for Covid19.” You should be able to (calmly) reply to a simple question as to who recommends it. It is strange that it took you several posts to come up with a relatively obscure group that advised a Governor not to ban the use of HCQ, and to spin that as a “recommendation”
In short you don’t HAVE to back up your claim. but if you want people to listen to you, you should.