ICONOCLAST

one who attacks or undermines traditional conventions or institutions

/a destroyer of images used in religious worship
SYN - image-breaker

someone who attacks cherished ideas or traditional institutions

"The punks loved him for his iconoclastic nature."

"The Joker, being a true iconoclast, alloyed the paintings by throwing red pain across them."

"The church knew that it was only a matter of time before a different iconoclast would come in in attempts to undermine and destroy their institution."