When a person never returns things that they borrow, do you think it's usually on purpose or accidental?

I've known a few people like this and I learned to never let them "borrow" anything unless I'm okay with never seeing it again. But I'm wondering if you think these type of people are aware of what they do and it's a conscious thing to be greedy and keep other people's stuff? Or do you think these people are usually just forgetful?
On purpose
Accidental
Other (please explain)
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To be clear, I mean when the same person makes a habit of borrowing things multiple times and never gives anything back.
When a person never returns things that they borrow, do you think it's usually on purpose or accidental?
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