Here's da problem with suicide by gun. It is often not the real cause of death of a person. It can be a staged act, when a wife rigs up ("arranges") the death of her husband.
There was a "death by suicide" of a cop on a neighbor island. Like a lot of acts, it was covered up by local authorities.
On the mainland, we have the case of a "texting suicide" caused by a nasty woman messing with the mind of her boyfriend. He died by carbon monoxide poisoning. She was convicted of manslaughter. Do we ban cars, using CDC reasoning?
Try telling that to the anti-gun zealots. They don't want to hear logic and rational solutions. They only want guns to "disappear."
Their line of thinking says without a gun handy, the suicidal person will be forced to choose another, less lethal alternative means. Therefore, the person will possibly just injure themselves and have a higher likelihood of surviving the attempt.
In my line of reasoning, if guns account for 1/2 of suicides that succeed, obviously there are other means that are just as lethal as guns. That other 1/2 that didn't have a gun or chose not to use one found effective ways to end their lives.
The next highest methods from the CDC stats are suffocation and poisoning. The suffocation category includes hanging, strangulation and suffocations. Poisoning includes:
X60 (Intentional self-poisoning by and exposure to nonopioid analgesics, antipyretics and
antirheumatics); X61 (Intentional self-poisoning by and exposure to antiepileptic,
sedative-hypnotic, antiparkinsonism and psychotropic drugs, not elsewhere classified);
X62 (Intentional self-poisoning by and exposure to narcotics and psychodysleptics [hallucinogens],
not elsewhere classified); X63 (Intentional self-poisoning by and exposure to other drugs acting
on the autonomic nervous system); X64 (Intentional self-poisoning by and exposure to other and
unspecified drugs, medicaments and biological substances); X65 (Intentional self-poisoning by
and exposure to alcohol); X66 (Intentional self-poisoning by and exposure to organic solvents
and halogenated hydrocarbons and their vapours); X67 (Intentional self-poisoning by and exposure
to other gases and vapours); X68 (Intentional self-poisoning by and exposure to pesticides);
X69 (Intentional self-poisoning by and exposure to other and unspecified chemicals and noxious
substances)
Inhalation of carbon monoxide vapors is included as "poisoning."
It doesn't take much imagination to find methods that are just as lethal as using a firearm. The only difference is someone may find you and provide life saving treatment, whereas a firearm is instantaneous.
It used to be common for people to jump from tall buildings, but many building owners have installed windows that don't open or only open a couple of inches, and security systems preventing access to roofs. This method seems to be less common now. That's good news for passersby, but it doesn't mean suicidal people decided against it just because they can't jump from a great height.
Humans have a great many ways to kill. There's no reason to think anyone will be unable to find a way if they are truly committed to leaving this plane of existence.