Question. Which is worse, killing 10 people with a van or 10 with a gun? The answer would be that there is no difference and therein lies a problem. While autos are harder to carry around and conceal they make excellent substitutes for inflicting massive casualties. This is not an argument against reasonable regulation as seen by the majority who understand enough to give educated input, but if this had been a gun we would have been inundated with outrage not because of death and suffering, but because of the means. In our society, it is far less of a wrong to kill someone over, many "someones" by van to use a gun.
Again I'm not arguing against regulations but the value of lives being weighed by the means used to intentionally end them.
The only remedy is to have a far far better understanding of mental illness and when it is and when it is not relevant to an individual being "safe" in society. Then we need to spend the requisite time and funds to address these problems.