But some people using their cars is a solution (for those people). After all, not everyone has the luxury of a job that can be worked from home.
Some people stocking up on supplies, to the detriment of their neighbors, is also a "solution"... to those people. Not to their neighbors. A "solution" must scale, otherwise it's selfish. Even worse, if a lot of people think "cars are the answer!" they are compounding the problem.
Fighting coronavirus requires a societal response, one that works for most people and where people don't take individual actions that seemingly benefit them (and only them).