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Early data processing machines were used in the Holocaust, for example. Or cipher devices played important roles in WWII.

Mongols did it on horseback. It's mostly a matter of will/capability and no scruples.

Why do we need modern weapons for defense at all then? Horses, bows & arrows plus will not enough?

Because attacks have evolved. Defense follows the attackers.

Good luck hitting a Mach 15 missile with a trebuchet.

Genocides are more common in the 20th century, because they are easier. Due to technology.