Yes but it's infinitely easier (which is my point) for multiple people to drive a car into a crowd killing 10 people at different times. The bar to be able to deploy on a large scale (by a single actor, not North Korea) is much higher and the group of people that could potentially pull it off is infinitely smaller for at least the reasons that I mentioned.

Anyone of us could drive into a crowd and kill 10 or many more people. Yet it happens extremely infrequently, compared to at least how many times it could happen.