First my friend,tell me his so called 'sin'. If you want to say he attacked bee,well bee,if survives,will forgive him seeing he knows itachi's truth as well. He attacked 5 kages you think in order to kill them?wrong again. In viz translation he clearly stated that danzo is his only target. He killed fodder samurais? well he clearly stated unless they don't interfere they are safe but oh well they were so eager to die. He killed danzo? well technically he didn't,if you believe naruto didn't kill kakuzo that is,but anyway i praise sasuke for killing that son of a ***** named danzo,that ******* was responsible for the condition of pain,kabuto,itachi,sasuke. Plotted with oro to destroy konoha to seize power,killed the messenger frog again for seizing power,etc. Once itachi's truth is out,he'll be a hero.