Yeah, treat humans as humans. the disabled, the elderly, the mentally ill, those who can't care for themselves, they should get help first right? Some situations are not zero-sum, this however is a zero-sum situation where UBI is funded by tax payers who would rather see their money spent elsewhere.
Either it is a general solution that addresses many social issues or it is a welfare program. If it is welfare then it needs to reflect society's appetite on who should get assistance. I do think even when the scope is narrow, it is better than what we have today where you really have to fight tooth and nail and surrender your privacy and dignity to get things like food stamps. But wealth distribution itself needs a huge shake up as well as a dramatic increase in taxation before UBI can be practical at a national level.