The right to assemble and air grievances against government are core fundamental rights. Police exist to enforce the law, police monitoring a protest means they believe a crime will result out of the protests and they need to prevent it,or it means they don't like the protests and they are interfering with the free excercise of rights.
As someone that has used Dataminr first hand, I can confidently tell you it is being used to monitor for threats. And as such and based on observed law enforcement response, I can confidently say anti-mask/lockdown protests where protrstors brandished weapons in public were not monitored this way. Plenty of care was taken to protect those people's rights.
The fact that the protests are against specifically police and the fact that police used cleat and absooutley unwarranted violence against both protestors and even journalists and also how white people had to form a human shield to protect black protestors should tell any observer clearly that the police see the blm protestors as a threat, simply for protesting and for airing their grievances against government in public.
Dataminr, palantir's excellent tools and many other products of the tech center were abused in racially motivated retribution against blm protestors.
In other words, while normally the police are a just arm of the executive branch that enforces laws(and they mostly are in few places in the US), most US police departments are technically a rogue insider threat against americans constitutional rights, they are enemies of the people taking sides in a culture war designed to tear apart the west.
If you ask me, this isn't a domestic law enforcement issue. I remmber in ecuador or somewhere in south america soldiers were protecting protestors against police violence (very similar to blm protests). The US military should show they take their oaths seriously and interfere, maybe this has been considered and they simply need judical or congressional authorization. Although given the nature of the protests and america's ironic disunity, soldiers may take cops' side. A very unpleasant situation.
You are not being paranoid if you are afraid if a civil war breaking out. Suddenly all the tech in the world becomes scary when used in a war against our neighbors.