If you want safety you can opt in like Google does with Safe search.

Generally, hiding and deciding who can access information in the name of public safety has never worked in the history of human kind, and eventually had always morphed to control of those without access.

We're concerned with society's safety, not just that of the user.

Citation needed on your second paragraph. We deliberately shape the information environment all the time for different reasons. It can be done. Of course there are limitations, drawbacks, and objections that reasonable people can make for philosophical, pragmatic, and other reasons. But the media generally does not report suicides because of the copycat effect. Governments implement elaborate systems to guard sensitive national security information including the workings of certain advanced technologies. Criminal records can be expunged. The sharing of health and education records are restricted.