I have a feeling that a few decades ago Americans were not such gunlovers as now.
Your feeling is mistaken. Americans have always valued freedom.
Yes many did have guns, but it did not seem to be a necesseity to carry guns and play wesstern sheriff or have a collection at home.
You are approaching this from the viewpoint of a European serf, as opposed to the viewpoint of a free American.
The term "necessity" may well apply to you, if you are only allowed to have guns if your government feels like letting you have them.
However, the term "necessity" has no place when it comes to free Americans. If an American chooses to carry a gun in public, that is their right. Whether anyone thinks it is a "necessity" or not couldn't be less relevant.
Also, that "play western sheriff" thing is nonsensical gibberish. Whatever it is even supposed to mean, no one is doing it.
Around 1980 1990 I have a feeling things really developed as a masshysteria
that one should carry a gun and have guns at home.
No. The mass hysteria is on the part of Freedom Haters, who cannot stand the idea that Americans choose to remain free.
It is clear from shootings and accidents most of all the gunlovers do not know how to handle a gun.
Nonsense. Speak for yourself.