The reason is personal preference. Same reason people buy sports cars. I also wish their preferences were different
Sports cars sure do have negative externalities. I live next to a custom car mod shop in the boonies. People hoon around here like there's no one else alive. They put my life and the lives of my family at risk on the regular. That is most definitely a negative externality.
And there's also wear on the road, noise, and damage to property and people when accidents happen (physics is a bitch).
I think more sports cars are burning out, revving loudly (or getting modified to take out their mufflers), and the damage from going a lot faster creates more damage.
It is true that some sacrifices and brief periods of discomfort must be made if you care for the environment, this is nothing new and generally accepted.