Protections for anything actually serious already exist.
one of our tenants disconnected the heating, blocked up all the airvents and flooded the shop below them.
the lack of airflow and heating caused a black mould problem. this had never happened before, never happened since......... and yet still WE were the ones who got very threatening letters from the council after the tenants complained. we fixed it .... twice i think before kicking them out - which was a painful process (which you also probably disagree with). they trashed the place but we still had to give their deposit back.
The protections which exist are not good enough to protect crap tenants from good LLs and equally not good enough to protect good tenants from crap LLs,,
they are crap all round, however 90% of the time it is only the crap LLs who get the coverage.