more than half of the shootings are suicides, so homicide isn't a qualification. and even after that accidental self deaths via guns is still a separate number. and then you even have the justified shootings that wouldn't be tracked in a homicide/murder statistic. so car deaths vs gun deaths is a fair comparison.
car and gun deaths are similar in number, within 10% of each other. and occur via the improper application of a regulated tool. tools which have several legal uses.
heart disease kills about 15x more people, it would minimize those numbers to compare them to gun deaths. heart disease is almost wholly a self created issue, at least at the rates we see.
if I was going to compare heart disease to gun deaths, I would correctly point out that in both cases its a PEOPLE problem and not a gun/pizza/hamburger problem.