>>89977012Reason 1: retards (and this is /g/, so...) say this because they read "MD5 is insecure", so to look smart they parrot it. Thing is, it's irrelevant to the discussion: your hashing program isn't preimage attacking your files.
Reason 2: if you're really serious about calculating hashes to detect file corruption or to detect tampering, the real solution used by people with actual functioning brains is to use more than one hash algorithm.