He probably means the people who riot, destroy cars, homes and businesses of average people.
Shooting them is wrong and this guy probably is a dickhead, yes, but a lot of normal, average citizens will agree to this.
Edit: To clarify, I mean that‘s how the right get‘s people on their side. Rioting will just result in more people agreeing with people like this guy, even if the message is absurd.
Yes, usually games with anti cheat, like Destiny 2. Although it’s way better nowadays, mostly thanks to Valve.