Dateline NBC "to catch a predator", possible entrapment?

[BCPVP]

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I have a question for people who are opposed to PJ's process.

Would your position be different if the process was altered a bit? Like this:

Real 12 y/o logs in to a chat room, waits for a predator to approach them.
Real 12 y/o chats with predator, until the predator initiates a conversation of a sexual nature.
Adult employee (or police officer) then takes over control of the account.
Adult employee sets up time, place, etc. to meet with predator.

In this case the argument can be made that there is a real potential victim, but the police are intervening in what could turn into a dangerous situation. I see no difference between this and, say, a parent who finds out their child is being harrassed online by an older man, reports the activity, and the police perform a sting using the child's account.

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I guess this is better in that sense, but something seems wrong/unethical with using children that way. I'd rather PJ stuck with whatever it did before it started working with police.