Off the top of my head (and feel free to add):
*Fredric Wertham:
https://en.wikipedia.org/wiki/Seduction_of_the_Innocent
https://en.wikipedia.org/wiki/Fredric_Wertham
*The filmmakers behind Batman & Robin (Joel Schumacher, Akiva Goldsman, etc.). I don't want to entirely single out Joel Schumacher (even though he isn't entirely blameless) because I'll give him credit for publicly apologizing for not delivering a better movie. Also, there were various other circumstances that Schumacher (rightly or wrongly) had to deal w/ such as the rushed production, Warner Bros. wanting to apiece parents and sponsors after the controversy that Tim Burton's Batman Returns caused, having to find another new actor to play Batman, etc.
*This is debatable, but William Dozier, the executive producer of the 1966 Batman TV series w/ Adam West. Because of Dozier's intentions or vision (who I don't think really had much true or proper respect for the comics) to make this particular adaptation of Batman a full blown campy, pop art, satire (instead of something more straight forward like his Green Hornet series), it stigmatized Batman to the general public (i.e. those who didn't regularly follow the comics) for at least, the next 20 years.
*This is another debatable entry, but Bob Kane simply for not wanting to give Bill Finger his rightful credit for helping him create Batman:
https://en.wikipedia.org/wiki/Bill_Finger#Credit
*Fredric Wertham:
https://en.wikipedia.org/wiki/Seduction_of_the_Innocent
https://en.wikipedia.org/wiki/Fredric_Wertham
*The filmmakers behind Batman & Robin (Joel Schumacher, Akiva Goldsman, etc.). I don't want to entirely single out Joel Schumacher (even though he isn't entirely blameless) because I'll give him credit for publicly apologizing for not delivering a better movie. Also, there were various other circumstances that Schumacher (rightly or wrongly) had to deal w/ such as the rushed production, Warner Bros. wanting to apiece parents and sponsors after the controversy that Tim Burton's Batman Returns caused, having to find another new actor to play Batman, etc.
*This is debatable, but William Dozier, the executive producer of the 1966 Batman TV series w/ Adam West. Because of Dozier's intentions or vision (who I don't think really had much true or proper respect for the comics) to make this particular adaptation of Batman a full blown campy, pop art, satire (instead of something more straight forward like his Green Hornet series), it stigmatized Batman to the general public (i.e. those who didn't regularly follow the comics) for at least, the next 20 years.
*This is another debatable entry, but Bob Kane simply for not wanting to give Bill Finger his rightful credit for helping him create Batman:
https://en.wikipedia.org/wiki/Bill_Finger#Credit