What the Mormons currently do, as best as I can tell, would better be described as "spray and pray." Or "throw something at the wall and see what sticks."
If they actually did target their solicitation based on some insight about who is actually interested in Mormonism, it would be better for everybody, or almost everybody. The people - like me - who are atheist and don't give a rats ass about Mormonism, would not get bothered by them... the people who were predisposed to join up, would. How is this a bad thing, exactly?
"Targeted" in any way, shape, or form is predatory and disrupts the many for the pleasure of a few.
I don't think "targeted" means what you think it does.