“He was a very young adult with unresolved trauma from years of parental neglect and abuse. When he was targeted by a cult, he told the Dark Lord about Trelawney’s prophecy in order to gain some sort of belonging and trust. When it all went wrong, he spent THE REST OF HIS LIFE trying to make it right, (SPOILER ALERT) DYING in the process.
He was a bullied student who wasn’t given the chance to heal and change, and he continued that cycle of pain as an adult. Severus Snape was responsible for a lot of shit, but it wasn’t his fault.”