This post hopefully will serve as a food for thought in times of trouble may you fumble upon (hopefully not). But as the verses goes: Buddham saranam gacchami. A diligent Buddhist would look back to our teacher, The Buddha, for an answer. And ask: What would he do?
Few ways people will jump for:
1) Past Experience (if any)
2) Peer/ Family
3) Intoxicants to distract
4) School of hard knock
Being a true blue Buddhist it is not right to let our emotions run wild in situations like this, it only serves to cloud our judgement. Calmness must be practiced.
Carefully analyse the situation and work on the intention you want to tackle it with. As all wars will lead to loss, do the good outweigh the bad. And what you did would morally defeat you if you followed your own set of ethics?
To suffer guilt for things you did and things you did not do is not what you want to face. Every step you take has to be a responsible one and you can touch your heart and say it was the right thing to do, instead of doing things right.