I object to this part of your comment: "HIV is no big deal; pop one pill a day and you will be fine."
It's true that in many people HIV can be successfully treated with "one pill a day". It's not true for everyone. The 'one pill' you mention, Atripla, is a three-drug combination, any one of which can cause unacceptable side effects in some percentage of those using it. Apart from side effects Atripla simply fails in a fraction of those who try it. Finding a drug regimen that is both effective and tolerable can be a grueling challenge. I do not mean to suggest that these difficulties affect the majority of people contracting HIV, but the possibilities are real and should be considered in making one's choices.
Further, we do not know what the implications are for decades-long use of anti-HIV medications. Those effects may be minimal, though the experience of the past 20 years suggests caution at overly-optimistic assumptions. Easily managed HIV infection also requires uninterrupted access to medication. There are many things that can disrupt that access -- loss on insurance, loss of government subsidies, economic disruptions that can curtail manufacture, transport and distribution, etc. There considerations may be more or less pressing in any given person's situation, but I suggest that the relative ease of management and treatment of HIV many of us currently enjoy is more fragile and contingent than we may like to consider.
I don't raise any of this to argue against barrier-free sex. The choice for barebacking is a valid one as is the choice not to bareback. It should be a fully conscious choice, as informed as it is possible to be. Acquiring HIV may not be the catastrophe it was 30 years ago but it remains a big deal.