Not to disagree with Evil People!?

 The gemora seems full of contradictions. Tonite I leaned that one should not figtht against Evil Men

Sanhedrin (110a)With regard to the verse: “And Moses arose and went to Dathan and Abiram” (Numbers 16:25), Reish Lakish says: From here we derive that one may not perpetuate a dispute, as Rav says: Anyone who perpetuates a dispute violates a prohibition, as it is stated: “And he will not be like Korah and his assembly, as the Lord spoke by the hand of Moses to him” (Numbers 17:5). Even the aggrieved party must seek to end the dispute. Dathan and Abiram accused Moses and by right should have initiated the reconciliation. Nevertheless, Moses was not insistent on this; he went to them.

However The Mishna Berura and many others say that one should protest against evil doers and hate them until they are defeated and destroyed