When I picked my daughter up from after school care today she tried to explain why she doesn't want to go swimming on Friday. In her viewpoint she doesn't want to be lumped in with misbehaving kids when she is behaving.
She thinks this will happen because even though she and a friend worked hard to help the childcare director they were still included in a reprimand and statement 'I'm disappointed in all of you.' That really struck her as unfair. She also felt unappreciated.
I mention this because this often happens in business. Managers/Leaders will include everyone in a group email or discussion - even those people who are performing appropriately. Well, it's those people who feel the sting the most. They feel like they are unappreciated; they feel like they are being blamed for things they haven't done wrong; they feel like they are being included with the bad eggs instead of standing out on their own merits.
This is a bad practice and should be stopped immediately. When you have people doing a good job and following the rules - let them know you appreciate their efforts. You do this, not only by telling them directly, but also by excluding them from reprimands, emails, or meetings that address poor performance.
While probably unintentional, the damage can be drastic.