Why are scientists having difficulty developing a vaccine againts AIDS?

As I understand it, it has been difficult to develop an effective HIV vaccine because the virus itself is so adaptive. Currently, there are a couple hundred active strains of HIV around the world, each slightly different, and each different when an individual has a combined infection (more than one strain).

Also, economics and the global politics of AIDS have proved an added barrier to the production of a vaccine. In the west (the US, Canada and Western Europe) AIDS is a very different disease than it is in extremely poor regions. In rich countries with access to long-term care, AIDS isn't always the death sentence that it once was. In contrast, in extremely poor countries, most people have little access to medical care or medication, and HIV progresses to AIDS quickly and wastes a person away in a year or two. As long as the severity of AIDS isn't seen as that type of problem in the very powerful countries, the development of a vaccine isn't going to be a priority for private drug companies or government funding.

Like war and cancers- population control.

the governments not lettin them make it

My guess is they need to see a lot of money in it first, and not something people can get on their own at low cost.

its a virus, who knows it might mutate? even the common cold has no vaccine... my best bet is that there wouldn't be a vaccine for it...

Vaccinations are bad for you!

A vaccinated person is MORE likely to get a disease than a non-vaccinated person. The whole theory of vaccination is flawed. It causes a weakening of the immune system thus making those who are innoculated more susceptible to disease.
There are so many awful side effects to vaccination that it should be considered extremely dangerous.
Just sit back and think for a while.
Is there any sense in injecting a disease directly into your bloodstream.
We have been subjected to an awful mind control program to enable the drug manufacturers to make a fortune.

The Vaccination Hoax
http://www.whale.to/b/hoax1.html