Word for "doing/getting away with something only because you're 'concealed' in a big group..."

Is there a word for this behavior?

Doing or getting away with something just because you’re in a big crowd setting where you don’t perceive your actions to be noticeable to most people and therefore there would be no consequences?
Google keeps trying to push “herd mentality” on me, but I’m not talking about someone following a pack, I’m talking about someone using the pack as a cover to do something recklessly as they feel no one would notice or care.

Scenario 1: Full big box gym class with 50+ attendees in close proximity of each other, Becky decides to have a full blown conversation with her friend while performing a half-assed workout, she thinks nobody minds, 50 sweaty bodies in one room and blasting music, what’s some extra noise on top of that?
But Becky also attends a boutique spinning class the next day with only 10 spots per class, also with her friend, but this time she won’t say a word the whole hour as she’s got more spotlight on her (less bodies around her) and is afraid of being judged for talking over the instructor.

Scenario 2: Becky finishes her favorite granola bar while crossing a very busy street, she throws it on the sidewalk almost certain nobody saw her or if they did they don’t care/won’t confront her about it.
But Becky also has a long meeting later that day, with her boss and 10 of her coworkers, for what she prepared in advance packing another granola bar. This time when she is done, she puts the wrapper in her pocket and a few hours pass by before she gets a chance to drop it in a bin, she doesn’t want the judgement of her peers if she would pull the same move she did on the street earlier that day.

Is there a word/definition for this type of behavior/mentality? Also an explanation? (Other than being deeply inconsiderate?)

Thanks.