Curate, connect, and discover
Honestly, I love the idea of a vampire who only drinks blood taken from blood banks and hospitals, because it so beautifully encompasses someone who's more concerned with the vibes of something than the actual impact of it.
Drinking from someone on the street, barring some other condition they may have, isn't likely to kill them unless you gorge yourself. Taking blood packs? There's always a shortage of blood, and having even less of it runs the very real risk of getting someone killed in a way that is wholly out of your control once you've sipped on that blood. Someone you can't assure the innocence or guilt of, if you're the type of person who cares about that.
Despite that, in popular stuff, I often see discussions of drinking from a blood bank being somehow better or preferable, and yeah. No. The only thing it does is make you feel better while doing more harm, because of that degree of removal. You're effectively drinking blood from someone on the cusp of hypovolemic shock, but since it's not straight from the tap, some people seem to think it's better.