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But Flash's Rogues do have a moral code, instilled by Captain Cold, and it's something he's always touted.
No killing (not just women and children, but no killing), no drugs, avoid hurting cops as much as possible.
There've been some conflicts, of course, and Cold had issues with his sister, Lisa/Golden Glider, who was dedicated to killing Barry because she blamed him for her lover/The Top's death, and with issues with the second Mirror Master because of his drug problem, but generally he's kept these rules strict
The Rogues are generally an okay bunch, in terms of criminals
it's why they've always had villains like the Zooms/Reverse Flashes show up - because there's only so much you can do with a group of villains who don't murder