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Violence in the context....
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To get rid of war Krishna became a negotiator between both the sides and himself becoming a ‘messenger for compromise' tried hard, with both the sides, to stop war. Not only that but he himself became a messenger from the Pandavas and convening a joint meeting, asked Duryodhan to hand over only five villages to the Pandavas. (Yet) Duryodhan did not submit. Thus, here, violence to oppose in war became a part of Krishna's duty for the noble cause of truth, justice and morality.
Sri Krishna, for re-establishing the religion of “Avtar for the defence of saints” had adopted ‘Avtara'. The question is : Why did Lord Krishna, who, though a great supporting pillar for the spiritually minded persons, the protector as well as defender of the masses, got honourable personalities like Bhishma Pitamaha and Dronacharya killed ? - the former as good as the apex of devotions to God and the latter being fully virtuous and the doer of morally good acts ?
The wisdom of Shri Krishna – the absolute 'seer' of subtle human relations and practical dealings – was wonderful. He was fully attentive to the welfare of mankind. In his eyes, compared to truth, honesty and justice a person however big he may be, was secondary. The individual who takes sices of the irreligious and the unjust becomes the supporter of the same. Even the religious person who gives shelter to irreligious and the unjust ones, may himself become irreligious. From that point of view, Krishna inspired Arjuna to pick up the bow and arrows and consider fighting a war the only source of happiness.
However nice a person, a gentleman Dronacharya was, he, taking sides with the irreligious, became ready to kill thousands of innocent people, releasing Brahmastra. The step Sri Krishna took against them was for the 'good' of the party