Government policy encourages homeless people to congregate in public areas twice over: first, cities destroy access to very-low-cost housing. Second, city governments often refuse to enforce their own rules of public-space use. Tent cities result.
Beyond the usual arguments about incentives and taxes, a Universal Basic Income is a dangerous policy that supercharges the state and threatens to heighten tensions between different groups in society.
The key to a high quality of life is a free economy devoted to trade and entrepreneurship. Contrary to what we're told about Europe's welfare states, more government social spending doesn't cause economic prosperity.