Point 1 already applies to existing welfare programmes. It seems to me that if anything, the divide will be reduced by switching to the UBI model, as everyone gets it, not just those who fulfil certain criteria.

Point 2: I'm not convinced that UBI worsens the opportunity for predators, compared to how things stand today. Why would it?

Point 3: I'm not convinced this is likely to be a real problem. Today, different countries have different levels of welfare. I doubt people are less charitable in high-welfare countries (although this is just a guess), and overall, you're certainly better off being down-and-out in a high-welfare country.