World Aids Day

As you all people might know.Today is World Aids Day.About a large amount of people around the world has this Disease.And im wondering.Why do people have AIDS? Like im pretty sure they knew to use a condom,or like that wearing a condom was goingto be safe,but...Why dont people wear a condom? It saves you from getting deseases and it only takes a few minutes.Well this is it the end of this thread.Thanks for reading and have a good day.