Do you think this would be a good way to keep the crime rate low in a city/country with UBI?
Currently, there is deployment of federal troops to "blue" cities with imaginary high crime rates, which are actually low. Truth is in short supply lately.
High crime may be associated with economically depressed areas, but how about fixing that problem rather than a symptom? UBI may help do that by raising the floor, giving people more purchasing power.
https://morbidology.com/the-town-that-got-away-with-murder/
I was talking to my wife the other day and she was testing a rather hard position which was that in traditional cultures disabled or crazy people were probably often quietly killed (see https://en.wikipedia.org/wiki/Of_Mice_and_Men)
You could imagine that a society that thinks that way could be well organized into vigilante groups that would eliminate crime by eliminating criminals. From the viewpoint of our society that seems terrible problematic (do they kill deaf people? all non-conformists? gay people?) but if our civilization collapses the survivors will turn their back on everything it stood for and the next nation might start with a bill of responsibilities rather than a bill of rights.
There are lots of good answers for why not to do this, but the simplest that is sufficiently decisive, I think, is Goodhart's Law.
> Do you think this would be a good way to keep the crime rate low in a city/country with UBI?
It would be a good way to make the official crime rate track the UBI-related policy preferences of whatever authority was in charge of crime statistics.