Joseph said:
“Though, a notable difference between the two is that a self-identified chareidi who is a tax cheat when asked why he cheats on his taxes doesn’t answer “because I’m chareidi and chareidim hold its okay to under-report owed taxes”; otoh, a self-identified MO when asked why they wear pants, shirt skirts or aren’t shomer negiah often will answer that it is because they are MO and they hold b’shitta that it is okay to do that. “
While charaidim won’t justify their improper behavior with the excuse of “I’m charaidi so it’s muttar”, there seems to be some that use charaidism as a justification for their bad behavior. For example, there is a community that took millions from the government to do various public works and pocketed the money. Or the guys in Beit Shemesh that would verbally harass DL girls. All of those charadim (and more) felt that their cause justified their actions.
While I’ve seen more MO people skirt halacha (pun intended) on an individual basis, the few charaidim that act improperly stick out.