1. Some guy is working on his property digging out his waterline and a neigbours kid falls in and is KILLED. Is that MURDER?

2. Some teenagers out for smoke behind someone's house toss a cigarette that starts a fire, KILLING someone. Is that MURDER?

3. Some drunk runs a stop sign and plows into another car, KILLING someone. Is that MURDER?

4. Some woman shoots and KILLS a man attempting to rape her. Is that MURDER?

5. A drafted soldier in Vietnam is in a foxhole and KILLS an enemy soldier coming at him. Is that MURDER?

6. A soldier at the village of My Lai guns down women and children as they try to run, KILLING them. Is that MURDER?
1) No that is accidental

2) No this is either Manslaughter (un-intentional killing) or negligence

3) Manslaughter

4) Self Defence

5) ... how could this be murder?

6) Murder

Murder is defined as intentionally killing an innocent or defenceless person

manslaughter is unintentionally killing an innocent

everything else is killing for a reason (soldiers and self defence killings fit here)