I was on my way to the sea and I heard an Israeli song about ''Ok beit hamikdash [Temple] how can we build you again? With faith and understanding בית המקדש איך נבנה אותך מחדש באמונה בהבנה  and it occurred tome that in fact that would be a good idea. in fact there is a specific commandment in the Torah tobuild the beit hamikdah. So why does no one do it? or even want to do it?