There have already been lots of clinical trials. The problem is, the clinical trials show clearly that Ivermectin works and is safe. That is not what they want.
You are absolutely right. We are witnessing a global propaganda campaign, sadly promulgated by even a few here on FR, to rid big pharma of the scourge of a cheap, effective, safe treatment for the Covid. If ivermectin and HCQ win, then the "vaccines" lose. And big pharma loses. A lot of money is at stake.