This is the direction the world is headin, son. Base it on age of population. The longer a population occupies a spot, the more of a festering sore it will become. Japans civilization has been int he same place for over a milenia, London has been around a little over twice as long s the USA. Its not the sodomy and abortions, its the fact that people have bee fucking there so long, and STDs are natures way of saying "you need to stop fuckin". These diseases will allways run rampent in the worlds population centers. Tokyo is packed now, imagine if there were NO abortions there, it would be a 3rd world nation full of cannibals.
so, to answer your question:
"should"? dunno, but it IS the direction it is heading in and there's nothing you can do to stop it. The best you can do is maybe put a 10 year dent in it, but consider the population explosion you're essentialy asking for. The outcome is always the same.