Bruno was a gay man in the thirties. When the Nosferatu found him, he was lying in his own blood, with his dead boyfriend in front of him. They embraced him, and made him strong enough to stand up for himself.
Their first surprise with the nascent childer was when he didn’t seek vengeance. He instead began to defend the helpless throughout the city. His insistance on righteousness ruffles feathers, but not for anyone who’d deal fairly with a nosferatu, so Bruno hasn’t seen the harm in it yet.