Cold chairs

While working in a cafe today I wonder if cold chairs here are intentional. Would people order more hot drinks? Would they stay less and open room for more customers? 

I always wonder how we could prevent certain individuals from hanging out in nice Seattle parks. There is a new park in Ballard intended for kids and families. Now the main occupants are homeless people smoking pot and drinking. Maybe we need to play non-stop kids music? Are there successful sitting spaces that prevent people from sitting there for hours?