If you keep using "orphaned" talking about DAG you'll never get the core idea of this new concept. Even those transactions that reference "double-spends" are useful, because they also reference legit transactions. I'll repeat again, if you send a normal payment and a double-spending then you increase security of the system. Validation of transactions is similar to https://en.wikipedia.org/wiki/Billet_reading, you mess with very young transactions but secure elder ones.