I see where you are coming from.. I’ve not had a issue and for 15p pence per lock for the piece of mind, not really much to think about. Also, these can be useful for many other reasons.. a.m. gonna use one for gym locker too.
Yes I don't bother locking them, airport security might cut them off if they want to look inside, anyone can get inside a zipped bag in seconds as per that video, the locks do almost nothing other than stop someone next to you in the queue from opening the case by unzipping and popping their hand in the case but the chances of that happening are slim and I leave nothing valuable or important in a suitcase and I'm very careful to not leave the case unattended or close to someone who might try sneak something into the bag.... I work at airports and learned long ago never to leave anything valuable in the case, locks offer almost zero security on zipped luggage and if someone wants to smuggle drugs in your case, a lock isn't going to stop them unfortunately. Flights to the USA suggest not locking your cases as they'll just cut them off if they want to look inside, supposedly 'TSA' travel locks will be opened if inspected but that's often not the case...your case is opened, the locks missing and a notice to say it's been inspected. A better deterent is to wrap your case in clingfilm as you see done on oversized or combined luggage, a service offered at Airports at the luggage / lost property place.
All luggage have zips.. does that mean you leave your luggage unlocked?
Hardly worth bothering if your luggage has zips, you can open a zipped suitcase with a pen!
Just went there too! Should have checked here before going..