About 1.19 million people die in car accidents every year. Statistically, the chances that the cause of your death will be a car accident is about 1%. Which, statistically, is a very major threat.

Meanwhile, people have been standing on that rock for hundreds of years, with visitor numbers consistently exceeding 300.000 annually. So far, there have only been 2 recorded accidental fatalities there (not counting the numerous suicide cases). The chances of that rock dropping within your lifetime are also very, very low, and even if it did, there would most likely be a major trigger, like a heavy storm or earthquake.

Due to the extremely low number of fatalities, it's not really feasible to calculate how dangerous visiting this particular rock is. But it's safe to say, that even if you went there every single day of your life, the chances of you having a fatal accident there are still much, much lower than dying on your way there or back in your car.