I let my 2 year old sit in my car all the time and play. He loves to pretend like he's driving, shifting, sticking the key in and out, etc... not sure WTF is wrong with that
FWIW, the windows are always down so it's not like he could lock himself in there (I have a spare in the house anyways) and he can't reach the clutch so would never be able to start the thing...