Do you have some data to back up your assertion, actual numbers? If you'd like to enter that number into evidence, you should source it. If you think taking the subway is risky, back up your assertion, don't just gesture in the general direction. Simply feeling it in your heart isn't enough to make something true. Not that there isn't value in your perception, but if we're going to talk about it we should know which is fact and which is feels.
You've cited the number of people that were killed in cars compared to the subway. Don't you think you should have also included the number of people that were also killed during their journey to and from the subway? Unless you do I don't really think that's a fair comparison.
I'm not the one making the assertion, you are. The burden of proof is on you.
I refer you to Brandolini's law, or the bullshit asymmetry principal. It takes much longer to debunk claims pulled out of thin air than it does to pull them out of thin air. So I'm not going to play that game. If you would like to cite a statistic, you must provide that statistic, otherwise it's as good as made up.
You're saying "I bet a lot of people died leaving subway stations" -- cool. Don't bet. Find it, share it. Then we can talk. Otherwise, I bet the opposite direction and your bet is exactly as valid as mine.
When you're doing that don't forget to compare the number of people who are killed or injured getting from the parking lot to their final destination. Unless you do I don't really think that's a fair comparison.