“Detective Superintendent Steven Woollett, of the Kent and Essex serious crime directorate, then warned vigilante groups could make paedophiles more evasive and said they should leave the job to the police.”
I’d say that if whatever the “professionals” are doing isn’t making paedophiles more evasive then it can’t be very effective.
I think what they mean is that Dark Justice will make these people think twice about contacting a child online, which sound like a good thing?