The people who actually manage to commit these acts are on an entirely different level of nuts.
Pedestrian example: How many gung-ho teenagers talk about joining the military? How many of them actually go through with talking to a recruiter, going to MEPS, and signing on the dotted line? And that's for a cause that is widely accepted by society and confers actual benefits rather than guaranteed violent death or lifelong incarceration in an elaborate concrete box in rural Colorado.
A lot of people don't share your irrational fear of guns.
The Nice attacker used no firearms and killed eighty-six people. The DC attacker used a firearm and killed no one. Is it possible that firearms aren't really the problem here?
For this reason some bikers carry hammers on their bikes, y'know incase repairs need to be done. In the case of Nice, a truck is inherently a weapon. Can't really regulate every truck though
The idea that "tool" and "weapon" are separated by intent rather than construction is so simple and obvious that apparently no one in certain buildings of Washington, DC, is capable of thinking it.