For type 2 diabetics, behavior changes should be a part of the treatment plan. That said, if you currently have diabetics and you don't get insulin you will die thus it does qualify as life saving medicine.
>Why don’t men stop having sex with each other and then they won’t be at risk for HIV?
While it is not pleasant, people are not going to die just because they have to stay abstinent. You don't even have to be abstinent, you can find a group of 10 or even 50 guys, make sure everyone is HIV negative and then you can do what ever you want, as often as you want, with no need for drugs.
Calling it a "life saving drug" is correct in many cases (NGO worker in parts of Africa) using the term "life saving drug" to advocate for people to be able to cheaply have unprotected sex with strangers is dishonest rhetoric.