Well, if your position is simply "bad tenants are a business risk," then you a) provide incentive for even stricter tenant screening, which is going to deny housing to many I suspect you would like to see housed, and b) ultimately drive out the mom & pop landlords, who are generally much better landlords and care a lot more about the upkeep and condition of their property.  As a result, you are going to be left with the giant, moneyed, corporate landlords who can afford to file the for-cause lawsuits, and let units sit vacant to wait for rents to go up to a higher market rate rather than get stuck with a lower rate under a rent freeze or rent control.

As I mentioned above, this is a difficult problem with no easy solutions, and I will support and work with people supporting actual long-term solutions to drive down housing costs (increased development, liberalized zoning, public housing trusts, etc.), but stridently oppose the proposals of PTU that I consider to be highly problematic.