Troubadour.
Which destroys the absurd notion that heteros are somehow remaining celibate or monogamous, while gay men are raving sex maniacs.

No-one has had that absurd notion.
You just made it up.

The infection may have started among MSMs here all those decades ago, but it crossed into the hetero population very quickly.
It was expected to become widespread in the hetero community, but it never did.

In Britain we did have an influx of people infected in sub-Saharan Africa who were hetero.

Dave, the increase in testing was not enough to counter the increased rate of infection.
That does not mean that increased testing "does not work."
It does.

As an ex-teacher I would never deny the value and importance of education, but I do not believe that anyone leaves our schools system unaware that STIs including HIV are transmitted sexually and that condoms offer some protection.