why.. why... madman123 ..why..why..you..no...post this in the Naruto section of the forums, instead of the generic shounen/seinen section?
Or indeed, why post this question in the first place? Because you're reading a shounen series and the answer to your question is pretty much "because shounen."
Edit: Doh, erased his message entirely.. classy. The OP question was basically why didn't/doesn't Madara just up and murder everyone straight away, preferably by cutting off everyone's heads. The first part of my reply is an edited copy/pasta of the original message.