Nicely put Dartmouth....

Mine stay on the lead as their interactions with other dogs tend to cause alarm to the other owner. Not aggressive, just not completely passive.

The number of times dogs have bounded over and the owner shouts those infamous words...."he's ok".... Only to get the reply.."mine isn't"

Some people, just like with kids etc, want all the fun but none of the responsibility. Same sort of person who lets their dogs mess without clearing it up.