I would legalise genetic purification.
Allow me to explain my idea.
You see, evolution has come about through the process of natural selection where desirable traits that help a species survive is passed on through the generations and undesirable traits are generally wiped out from existence. This way, only the best genes are carried through and concentrated in the species. As a result, the species becomes stronger and stronger.
Humans, on the other hand, have developed a very advanced brain. This has allowed us to survive to this day. Now we have weapons to protect us, methods of transport to allow us to move faster than predators, machines to make and gather our food for us and medical technology to enable us to survive when we become sick and reproduce even when nature doesn't permit us to.
Because we hardly need to think to survive in the modern world, not only are humans losing their survival skills, we're also weakening our species. People who have genetic diseases, such as haemophilia, cystic fibrosis, phenylketonuria, and Down's syndrome are being allowed to reproduce and as a result pass on their defective (undesirable) genes on to the next generation and into the gene pool.
As human's think that they are so smart, they've also found a way around nature's way of preventing defective genes from being replicated. You're probably familiar with concepts of IVF, surrogacy and gamete donors. Technology is most certainly worth the celebration, but biologically, we're destroying ourselves.
Not to mention the amount of processed foods that are around today. So in addition to weakening the genes of the human race, we're also destroying ourselves by eating empty calories and polluting our bodies with carcinogens.
Of course, with our highly advanced brains, came the idea of human ethics. To take a human life and not do whatever we can to preserve it is a sin. Well, if you want to destroy billions upon billions of people and a slow, painful process over several hundred years by letting them flounder in their own muck, as opposed to clearing out the trash as it comes in... Well, go for it.
Of course, we could always just fix these problems with our fabulous technology, but right now, we're not that smart. So why do something the hard way when you could just do it the easy way and let nature take it's course.
And that is my reasoning behind my idea.