There was an economics paper published on this question, which I have somewhere but can't seem to locate at the moment. The authors objectively demonstrated the approximate number of people who have been killed by the TSA since it was established. They controlled for variables such as seasonality and changes in base level demand to estimate the number of people who decided not to fly because of the TSA, and who travelled by road instead, then applied the difference in mortality rates between these two modes of travel to calculate gross deaths, and then substracted reduced terror deaths to estimate the total net increase in mortality arising from the TSA. Will post here if I can find it.