They do it so you don't have to. Of course some idiots are going to mimic them anyway, but people like that probably would've done something stupid with or without inspiration.
While I am into older cars and performance and all that, I tend to lean towards being an environmentalist without being an "eco-mental". My current car, when I build it, will be fast but it will be a twin-turbo 6-cylinder with a 6-speed stick.. and it's about as light as a 90s Ford Escort. (under 3000 lbs., unlike most newer cars)
I love what they do.. especially stuff like showing that a Prius is garbage, and depending on how you drive it, may get worse mileage than a performance car. Of course, many people don't think about things like that (the message is "it's not what you drive but how you drive it") and just go shooting their mouths off about how evil Clarkson and company are.
Someday I'm going to perform some major experiments of my own on making a different sort of hybrid.. but I have other major projects to get out of the way first.