Also, what a shitty analogy: suicide is by definition a self-harmful act, DUI is almost always a socially-harmful act on its own.
(And in many states, you can DUI on private property, by the way.)
"59% of people who died in crashes involving alcohol-impaired drivers in 2022 were the alcohol-impaired drivers themselves"[1]
Also, people who commit suicide with their firearms typically have families who suffer.