I don't know what I'm voting on this yet, but it's certainly not a simple matter, and there are many smart and compassionate people who don't support the measure. Here are the mayor's thoughts on homelessness (https://medium.com/@LondonBreed/a-bold-approach-to-homelessn...) and why they oppose the measure (https://medium.com/@LondonBreed/statement-from-mayor-london-...)
As I mentioned I don't know which side I'm on yet, but to just lash out at someone who opposes the measure as "disgraceful" means you're either uninformed or unwilling to consider other reasonable perspectives as legitimate. Either way, you can do better