You can't fight politics with tech, because politics win every time. Some of the things you listed don't make much sense when people are angry enough to spill into the streets to protest.
For example,
> - Combatting disinformation and/or processing data, about police abuse for example
There's already a lot of transparency on police brutality; we even have civilian oversight groups dedicated to this, but they have either been taken over by cop-friendly leaderships or they have no power to do anything.
> - Mobile panic button?
And who will come to help? Police? No, they will beat your ass for revealing your location. Protestors? No, they are too busy protesting to check their phones 24/7. Just look all the people with their hands up and chanting; their eyes are all on the police who may beat them at any time.
> - Mindfulness/mental health assistance for people trying to cope
There may be people who are depressed, but people are angry enough to be outside and protesting. Those who are clinically depressed need actual professional help, an app will not do that. Plus there are already a lot of these types of apps in the stores already, none of which replaces an actual professional
... and in any case, the government can shut any of these solutions down if they truly wanted. I think the most direct, practical way to helping with current events is to either, or all:
- Join the protestors in the streets, see the issues at hand with your own eyes instead of from media spin.
- Get in touch with your coworkers, an existing union, or start a tech union underground. Organize a walk-out, to join the protestors. White collar jobs can cause some real financial pressure and bring politicians to their knees for the cause (like how some workers at fast food restaurants refused to cook for cops during the protests).
They (literally) fight for our rights, we should get serious about what we can do too.