"It stems from irresponsible, unrestricted, and unprotected gay sex."
In the U.S., perhaps. However, all those straight women in Swaziland weren't infected by gay sex. That is what can happen if a government doesn't take it seriously.
I would suggest that the disease is spread by those that do not take the possibility of transmission seriously REGARDLESS what the government may or may not do...
Of all the transmission methods I assert that male on male anal sex is the most probable transmission method AND the method not taken seriously enough by the "gay sex" is normal crowd as evidenced by your evoking the "straight women in Swaziland" canard...
A. A lot of what is called AIDS in Africa is actually other diseases since they often go by symptoms rather than testing.
B. If people in Africa (or elsewhere) abstained from anal sex, dry sex, and stayed monogamous, the AIDS problem would resolve itself soon.
C. Clinics often reuse needles - another really effective way to spread all manner of diseases.
If someone rejoins with "how can you expect people to abstain from those practices and be faithfully married"? My answer is I don't expect anything. But this world is run by inexorable natural law; and everyone has free will whether to abide by those natural laws or not. If someone chooses not to abide by natural law, s/he will suffer the natural consequences.
It's not possible nor advisable to try to bail everyone out who chooses to break natural law. Sometimes getting burned is a good way to learn not to stick one's hand into the fire. Sure taught me.