The difference is that Trump likes to promote himself in any way he can. So he hitched his wagon to CQ and HCQ before their true efficacy was known AND promoted

The difference is that Trump likes to promote himself in any way he can. So he hitched his wagon to CQ and HCQ before their true efficacy was known AND promoted it as a miracle cure before that was actually known. He later tempered his speech with "shows a lot of promise" but his initial statements basically said "if you can get your hands on it - you should get on it ASAP" which is irresponsible of the POTUS. He's not a medical expert, but he loves knowing things and regurgitating them to sound smart. He wanted people (in case it panned out to be good) to attach his name to CQ and HCQ. That is selfish.