The city has just launched a plan to clean it up. https://boston.cbslocal.com/2019/10/04/boston-methadone-mile-plan-drugs-homeless-crime/  Sorry to say that I'm not optimistic about the potential for success. 

The thing I did is know how much I could lose without making my family (wife and kids) homeless.

As one of those landlords who give landlords a bad name, I allowed them to remain because we didn't want them to be homeless after their (adult) daughter who was on the lease left them high and dry and their (adult) son wound up on the pills and got arrested.

Sex offenders are clearly not all homeless...

Does that mean you are only home less then 60 days per year? 

They (family of 5 plus 2 dogs and 2 cats) currently moved in with family, so they are not homeless. 

They typically aren't nice places but they are a step above homelessness.

A homeless guy showed me the properties hidden a wooded area,l.

Worst case if it’s illegal and you get caught you could just stop that and wouldn’t be homeless

I assume it's because they know it would lead to exponential rent increases and eventually quadrupling homelessness.