I think it makes sense that Kirk was suicidal. Many suicidal people exhibit reckless behavior, especially if they are undecided about what they really want (there can be a difference between wanting an escape from reality and wanting death, for instance). Kirk didn't entirely look happy when driving the car, he alternated between looking upset and looking like he was out for a joyride. He seemed troubled in general.
That whole scene didn't sit well with me until I first heard people propose he was very emotionally troubled or attempting suicide, then the pieces started to fit.
That whole scene didn't sit well with me until I first heard people propose he was very emotionally troubled or attempting suicide, then the pieces started to fit.