That is not how it works. The police does not need this. They also will not really use it. However, this does give repugnant ideas a place to spread. It normalises them. It makes things much, much worse.
I get where you are coming from, but, can we look at three historical examples of repugnant ideas?
1. The earth does not revolve around the sun.
2. Slavery is immoral and man should never own another.
3. Women should take part in the voting process.
There are millions I'm sure from "You need to wash your hands to stop the spread of invisible things that kill people" to "Public executions as decided on by a King are not good for our society" to "The indigenous people here should have the same rights and protections we afford ourselves".
We are wrong about stuff all the fucking time! The humans in society that argued for the worst things, were the same as us. What if we are drastically wrong about any event in the last year? Where do we discuss it without fear of reprisal?
I do not think it's a good idea to "pre-decide" on what is a "repugnant idea". This is what conversation is supposed to be for.
Whether black people should be allowed to live? Gay people? Trans people?
Who is it you still need to have a conversation about whether they are allowed to have human rights?
We might, but the users of Parler et al quite specifically do not.
You’re being deliberately disingenuous. The racism on display in any unmoderated space is foul and horrendous.
Are you entirely sure about that.
It's a gold-mine for every law-enforcement service on the planet, for good or ill. They drop to their knees every night, and thank God for Twitter, Facebook, Parler, etc.
And, you might be partially right -- it'll only work for rounding up the really dumb ones. All the smart ones are already on Signal, Telegram, ...
But, seriously. This has got to end.
Throwing a kid into juvenile detention because they yell at their friend "I'm gonna kill you!" in the middle of a game or make a gun shape with their hand at school has got to hold different weight than someone posting an instructional video on beheading. But, no, you have kids kicked out of school because someone saw a toy gun on a Zoom call...
The real problem for police is that they have 5% of the population being called "Racist" or "Terrorist" or "Nazi". Not 0.001%. They can't possible track down any real risks.
However, a social network using K-means Clustering easily isolates the "everyone other than me is a racist" crowd, from the "we're normally quiet and tolerant, but holy smokes this guy has really lost the plot" crowd.
The police could use that kind of help.