Light's method was nightmarish and irresponsible, and if no one would have stopped him, he would have probably ended up killing off the entire planet at some point. He was talking about eventually using the Death Note to kill off people who are lazy. Think about that from the perspective of the top student in Japan. Yeah, I don't want someone like that ruling the world and deciding who lived and who died.
Those who root for Light completely miss the point and the lessons imparted from Death Note.
Seriously, in the end, Light was like a toddler wielding a magnum, and it worked out for him just as well as that actual situation would.