I don't think IBU but would like to ask MN for opinions or advice , especially if there's any law regarding it
So for background , I live in a small seaside town where young kids cause trouble quite regularly ( there's always a Facebook post most nights about this sort of stuff )
I work in a supermarket where I've seen guards, customers & staff verbally abused by kids , sometimes as young as 12. Recently one of the guards had a bottle of pop thrown all over him for trying to get a group of kids to leave after one had been spotted stealing sweets.
The local bus station is also the same , big groups vaping , sweating etc. It's gotten a lot worse since the summer holidays have started
Anyways , today I was standing outside a shop waiting for DM to grab something she needed & I was just looking at the items displayed in the window
( think sort of tat / junk shop )
I noticed in the corner a lot of knives on display , like pocket knives , a Batman double knife & others
I wondered if it was legal / morally right to do so considering there is a rise in knife attacks especially amongst young kids.
I mentioned it to DM who said the man who owns the shop is lovely , I said that didn't matter
Basically she told me it was none of my business 
I can't find any laws on shops displaying them
I know in supermarkets there covered in plastic , also we challenge people who look under 25 if they try to buy one
WIBU to just report it to the police ?
If they already know & it's all within the law , no harm done I suppose
I've added a pic to show the style of knives & how easily displayed they are