Why would you say that? it's nice to have family rides b/c not everyone can ride extreme thrill rides because of height restrictions and other factors. Just b/c someone thinks family rides are a good thing for a park to have doesn't mean that it's ruining the amusement industry, if anything, it's making shorter kids have a better day if they weren't tall enough for a coaster or something they really wanted to ride.
i do also agree that there should be lots of thrills, but you have to consider everyone. lots of people go on family vacations to theme parks.