3 simple points to end the discussion with any Sunni/Shiite

[R00tKiT]

 The basic grounds for any successful debates with a Wahhabi is very simple. Use the Quran only and don't allow the Wahhabi/Sunni/Shiite resort to the Hadith.

Question begging, you're assuming that the hadith is unreliable to defeat the Wahhabis who think it's indeed reliable. 

2-Bring up the victims and fatalities that fell due to following the Hadith:

fell due to following the hadith.. lol. I won't break a sweat responding to this ridiculous claim, suffice it to say that you're arguing from consequences. That's a fallacy, invalid.

3-Show him that Sunni Islam and Shiite Islam are perfect religions for any dictator.

If a dictator goes against the core teachings of Sunni Islam, Muslims are explcitly allowed to overthrow him by any means necessary. I think that's enough to invalidate your claim.