If you think that running a sting operation to catch pedophiles is going to lead to a Third Reich-esque roundup and extermination of minorities I really don't even know what to say.
The patriot act and the revoking of rights without due process was sold as something to fight terrorists. Now we have common street criminals being charged as street terrorists to circumvent due process.
It simply is fact that govt is the most serious threat to citizens. This is why the constitution was created and the nation was architected as a constitutionally bound republic.
This tripe of "think of the children" has always been used to get more power by govts and will continue to happen.
I suggest an alternative: how about judging people by the harm that they have committed to others rather than their race, attraction, opinions, etc?
When you let the rules slip eventually that slippage will be used against you.
History shows this...
First they came for the socialists, and I did not speak out— Because I was not a socialist.
Then they came for the trade unionists, and I did not speak out— Because I was not a trade unionist.
Then they came for the Jews, and I did not speak out— Because I was not a Jew.
Then they came for me—and there was no one left to speak for me.