Yes sir you are absolutely right!!!
But according to me we are all sinners.
Perhaps God? "if God exists, he'll have to beg my forgiveness" a phrase carved on the wall of a concentration camp cell during World War.

"This World Is Rotten And Those Who Are Making It Rot Deserve To Die. Someone Has To Do It, So Why Not Me?"- Light knew he could make the world perfect with the help of death note, if you turn the pages of a history book, you would find leaders and dictators with the same ideology, just different means, I wonder why a 17 years old boy with noble motive had to go way beyond his line, to the point where there was no in-between good or evil,
Maybe there is no right way to make the world a better place?
Perhaps not all felons would deserve such a fate but I remind you that he wanted to kill only the ones with serious crimes. An eye for an eye, as they say so why not a life for a life? Take life and lose your own. Ruin a life and lose your own. Besides, if you're dead you can't hurt anyone anymore.
What would you do if you found a death note?