It's not, the probability of a SpaceX rocket spectacularly exploding is somewhere around ~1%. They'd need 860 more problem-free launches to hit ~0.1%.
The probability of a truck spectacularly exploding on its way to the launch facility is way less than 0.1%. In fact, it's astronomically lower than 0.1%.
> They'd need 860 more problem-free launches to hit ~0.1%
For what it's worth, SpaceX claims that they intend to reach this level of safety by literally performing thousands of launches. Time will tell if they can do that.
