This is one of those you mentioned on which I can speak with authority.
1- Holy Book Gita and Krishna says - For "dharm" i.e. the rightful duty, one shall not be averse to have war with their own kith and kin. The Mahabharat war was based on the same.
2- Holy Book Ramayan (Ram) - Raised war against evil Ravan.
3- Why do you think why most of the Indian gods are pictured with multiple weapons?
4- The one of three biggest gods - Vishnu who incarnated as Ram, Krishna and many other was born to raise the war against evil.
5- The other of three biggest God - Shiva - is know for his destruction and anger.
The same religion which created 4 varn i.e. caste based on the type of work allocated created Kshtriya or say rajput who were entitled to fight for the right of other three varn which were Brahmin, Baniya and Shudra.
So where did you get this impression about Hinduism?
Jain and Buddhist do believe in utmost peace and are best suited for utopian society and not the practical one.