Originally Posted by
BadgerBoi
not really. Locking luggage helps prevent zippers coming loose. Last time I lost my lock I "locked" my suitcase with a keyring. It's not to keep it safe from someone opening it, it's to prevent it accidentally coming apart.
This is the main reason.
There's also the issue of dirty baggage handlers. A locked suitcase takes more time to get into, they'll be more likely to go for the unlocked one.
Locks are completely useless against thieves that make off with bags.