Why do "financial experts" hate Bitcoin?
Financial experts do not hate Bitcoin. Some might hate Bitcoin -for several reasons including a conflict of interest as you suggested, but not all of them.

There are countless financial experts in the world including founders and investors in Bitcoin based businesses. Just do some more in depth research and you'll find them.

I looked at that page you provided the link to. My suggestions is don't take the Expert label for granted. Take a look at who these people actually are. Be vary of anyone who expresses a very strict opinion about something they don't necessarily understand.

I saw evidence of both non-expertise and outright ignorance on that page.