>>7477753The second edition says
http://wodcodex.com/wiki/MoralityIntegrity
Mortals, Hunters
Breaking points occur when the character violates his personal moral code or acceptable societal bounds, witnesses something traumatic or terrifying, or is the victim of a supernatural assault or shock. The severity of the situation and the character's current Integrity apply situational modifiers to a roll, and a Condition is incurred. Common breaking points leave a character Guilty, Shaken or Spooked, while dramatic failure can cause the character to suffer Broken, Fugue or Madness.
I don't think killing someone who was trying to kill your party violates any kind of personal moral code or societal bounds. If you want to look at 1st edition, Hunters can 'change' their code based on the Hunt. Also morality 7 can tolerate selfish thoughts, selfish acts, injury to another, and petty theft. Robbing the hobo would fall in line with that