These wars, blood, conflicts, and what not are the very founding stone of civilization.
Look at Europeans, look at Muslims---these two peoples have arguably waged more wars over a more sustained period of time than anybody else out there..
And only these two peoples have created
global civilization across
continents...
If early Muslims were pacifists, Islam would have been annihilated in its earliest stage or AT BEST would have survived as a local desert cult confided to Hejaz region of today's Saudi Arabia.
But look at it now...it is a global civilization/culture shaping the lives of billions, forming the constitutional basis of various powerful nation-states, and shaping the culture across the globe in multiple continents!
It's easy to say it today---but in previous times, where there was no law, it was all fight for the survival and expansion. Those who did it successful are better off now compared to those who didn't show the willingness to go beyond their borders and risk-it-all for their own expansion and ultimate survival..
Islamic Civilization, established
globally across various continents!, is all set to encompass 1/3 of humanity as human expansion reaches its peak (towards 11, 12 billion number).
Islamic World is on path to be
the largest civilization at the time of humanity's PEAK...the largest/most global culture...and with gigantic amount of overall power (still not the most powerful as it remained for almost a thousand years before--but still, one of the most powerful/influential overall).
It wouldn't be the case if early Islamic peoples "gave in" infront of giant Romans and Persians, and didn't fight for their survival and expansion in 7th, 8th, 9th, 10th, 11th, 12th, 13th, 14th, 15th, 16th, 17th, 18th centuries---ultimarely conquering huge swaths of previous empires, peoples, and spreading across Africa, Asia minor, Arabia, India, Central Asia, and beyond...
Now, the world/humanity has achieved "stability" and there's no military conquest and culture-change possible as in previous times. So all these "gains" globally have become permanent--so those peoples who did made those "gains" have the most benefit (Europeans and Muslims)---while all others are localized, and will most likely stay so forever.
Muslims have no even established their civilizational/culture presence in the heartlands of Europe and wider Western World---something that wasn't done at this scale previously.
Islamic Civilization is the only global/major civilization still "spreading/expanding" everywhere--while all others have either stalled or even regressing in terms of depopulation.
By 2050, Islam would be 10% of Europe (up from 5% today) and 18% in India (up from 14%)---while both of these major peoples/cultures are either stalled or decreasing.
And Mashallah to all of above
The problem for hindus today isn't that of being pacifist--since there's no threat of military overrun as it was before previously---thanks to technological advancements.
The challenge for Hindus is to keep their culture and expand within themselves (a battle which they aren't winning).