All rulers of pre modern India fought among themselves. They raided, invaded territories of other and in pre modern ages might was right.
There was scant regard for the soverignity of a country. The arab chroniclers say of the Byzantinians as: If you donot fight them, They fight you!
This is practically true of all rulers. Ashokas conversion to Buddhism was based on a war that he fought which killed millions of people. It is chronicled that a river of blood flowed and river waters turned red!
So do we start judging a religion which represents a world civilisation by acts of few?