What responsabilities do we have to each other?

As shown by the monster's distress and his need for company, one of our responsabilities is to take care of things/persons we created. If Victor hadn't run away, maybe the monster wouldn't have killed. The monster's actions were a consequence of Victor's lack of responsability. We also have the responsability not to make problems that involve other people that weren't concerned in the problem's creation. I don't think that William, Justine, Henry and Elizabeth wanted to die in this way, and probably for something they even not understood. Maybe it links us to the responsability of telling the truth. If the monster had been publicly "showed", he could have had some people to speak with (at least people would know he exists and isn't bad in his heart).