What do you think of "predator catchers" on youtube?

There are a lot of amateur creep catchers on YouTube in different cities and states throughout US and Canada. They are kinda controversial in a sense that people think that maybe their videos are not admissible in court and Walmart does not like their presence. But at the same time parents praise them for trying to save their community. Its like there's a grey area when it comes to this.
What do you think of "predator catchers" on youtube?
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