When UBI means that nobody has to starve, there is no longer any justification for anyone to beg. Petty crime rises when people have nothing left to lose, watch it fall when you give them something to live for.
I am sorry to differ so strongly, but that is claiming a panacea that is not going to be real. There will NEVER be an abandonment of panhandling. They will always find a rationalization for it.
And the presumption that crime will melt away is a forlorn hope. It will not. A UBI will not afford for the slothful an income that buys beyond basic needs: food, housing, and some transportation and personal effects like modest clothes. That will absolutely not satisfy the larcenous today. They steal premium items, and not so much for resale to put food on the table or for their kids. They steal TVs, expensive shoes, electronics, games, and on and on, TO HAVE. They want the non-essentials because they feel they are entitled to them without working to earn them.
As for starvation, that's simply not a product of wagelessness in America. There are plenty of food banks, soup kitchens, food pantries, and generous souls who are ready and willing to see that no one goes hungry. But, the children of abusive parents, of addicts, or those who are too proud to accept help, go lacking, albeit rarely starving. And sadly, like some pernicious virus, those who DO go hungry are the victims of circumstance and families that seem to make every wrong decision possible, preventing their own help or salvation.
UBI won't usher in some Halcyon days, but will result in monumental abuse, theft, extortion, and inflation, just as the unregulated COVID funds did.