Who cares? Powerlifting is never going to be a mainstream sport and this is hardly going to be what puts the nail in the coffin. Fill me in here, what "general public" is it that you know that are not only going to be aware of Ryan Kenelly's arrest for this, but are going to be informed and decide that this is the reason they're going to look down on powerlifting?
The same shit happens in olympic lifting and bodybuilding and they're doing just fine, and it happens in every other mainstream sport and they're doing fine as well. Trivial shit like this has nothing to do with why powerlifting is "looked down on" and it doesn't make "the sport look bad."