Its fear mate, driven by a media that thrive off crime stories for clicks and sales. The more horrific the better, crime sells as Netflix has discovered.
I don't think people want or support vigilante mobs they just want to feel safer and rightly or wrongly they feel the present system doesn't do that effectively enough. The two scrotes in this programme are prolific career criminals with long criminal records already. The one who was supposedly in a critical condition discharged himself from hospital and was back out robbing straight away. How do we break that cycle with these people who are just a constant nuisance to society and don't want to work for a living?
The police say, "Leave it to us" but people have lost all faith in their ability to do that job. I think there had been a spate of burglaries in that area and that was probably in the householders mind when he saw them trying to break into his property. Driven by the "They're not getting away with it this time!" mindset he took the actions he did, sadly to his and his families cost.