That the bounty sounded like that is enough to make it harmful and despicable. There are enough wingnuts out there who don't think about niceties that you can easily have someone jumping in and starting to assault someone who appears to be the wanted person (but probably isn't).
When "The Circle" (minor spoiler alert) demonstrated just how such "crowdsourced chase" scenario can rack up a body count, the target wasn't attacked - he died because some excited rando fucked up and caused a traffic accident with a camera drone.
It's not the wingnuts I'd be afraid of. It's the overexcited normies.