Interesting.  I looked further into it.  I was shocked to see the existence of HIV - AIDS deniers.  Even more surprising was to find people who deny existence of the HIv virus and even viruses at all.  

Though does HIV really cause AIDS was a good academic question.  And a part of scientific process.  The line of questioning was started by [Duisburg](https://www.ncbi.nlm.nih.gov/pubmed/2644642/?ncbi_mmode=std)  back is 1987, 1989. However it seems that after almost 38 years with so much evidence people end up asking the same question.  In fact there a very few academic studies who still make these speculations.  

I think majority of it revolves around the idea that why not all HIV+ people progress to AIDS?  Based on this many think that HIV is not sufficient to explain AIDS and need other factors to act synergistically.  However,  it rather appears as if some people have more resistance to progressing to AIDS as compared to most who would die because of AIDS.  It is not like only rare people are prone to developing AIDS on HIV infection.  

Then,  second confusion may arise because HIV is not targeting to kill a person.  It kills CD4+ T cells.  Which causes immunodeficiency and then other infections kill the person.  So yes for fully fledged AIDS you need other infections to occur.  But what made it so easy for these infections to occur?  The answer beyond doubt is a virus called HIV that made people immunocompromised.