What makes you think I insist on breaking Singaporean laws?
Maybe not you specifically, but why would anyone bring drugs in their luggage on a transit flight through Singapore. Why would someone not have a basic understanding of breaking the law in the countries they travel to/thru?
A lot of people, especially many who use marijuana, are quite disorganized and forget about all sorts of random items in backpacks, suitcases, etc. between trips. So it’s a very real possibility
Where is it legal to bring weed across country or even state lines? There's no way to "forget" to remove something from your luggage that's universally illegal, unless you've choosen to flout the law because it's easy to get away with elsewhere.
You’ve never left something in a pocket before, or dropped something into an open suitcase without noticing it?
Maybe coins or random pocket trash, but never illegal drugs. I think I would notice 500 grams of weed, which is the minimum to receive the death penalty in Singapore.
Half a kilo isn't easy to overlook, I'll give you that.