Couple of years back I was in TK Maxx and this dude just sidled up near me where I was looking at coats, pulled out this almighty sized bag (think the huge Ikea bag) and started stuffing coats into it. After filling it, walked straight out and nobody batted an eyelid about it.
I can see why people don't get involved tbh as about 30 years ago I was working at a leisure centre when a young teenage girl decided to nick someone's purse from the changing room and leg it out. One big fail on her part was she was still wearing her swimming costume and left her clothes still inside a locker when she decided to leg it with purse in hand. I got a report on the radio of the theft and legged it after her as she ran off down the seafront, then the penny dropped as she was bare footed and only in her swimwear, so she stopped and I carefully walked her back to the centre.
Unbeknownst to me or her, she'd stolen a police officers wife's purse and he was stood at the reception when I walked back in with her, still in his swim shorts. He started shouting at her and called her by her name, so he knew her but then said, without ID that he was a copper and that he was going to arrest her for theft. I said "Not a chance - I have no idea who you are, even if she has stolen your wife's purse." He wasn't happy about it, but eventually he identified himself and we let it take it's course.
About a week later we had a couple of officers come in as they did just for a browse on their beat (when they still used to do that) and I mentioned about the theft etc and they said "Oh yeah, we heard about that. It was Sargent BoatyMcBoatFace (no idea of his name) from the next big town over - he wanted to arrest you for obstruction of justice."
So yeah, I retrieved his wife's belongings for him and the thanks I got was he wanted to arrest me for obstruction because I didn't believe he was a police officer when he's only stood there in a pair of swim shorts. Oh and neither him, nor his wife said thank you.
This is why I won't get involved unless it's ever directly my family or friends.