> No, all killing of innocent people is murder.

Imprecise and ambiguous use of words

>There are degrees of murder, but involuntary manslaughter is both illegal and immoral.

Is manslaughter murder? It might depend on context.

> Homicide occurs when a person kills another person.[1] A homicide requires only a volitional act or omission that causes the death of another, and thus a homicide may result from accidental, reckless, or negligent acts even if there is no intent to cause harm

> Murder is the unlawful killing of another human without justification or valid excuse, especially the unlawful killing of another human with malice aforethought

> Manslaughter is a common law legal term for homicide considered by law as less culpable than murder. The distinction between murder and manslaughter is sometimes said to have first been made by the ancient Athenian lawmaker Draco in the 7th century BC.[1]

> To say it's inferred by design is to say it's designed to be flawed.

Laws are subject to modification. Nobody would have assumed social security law as written in 1935 would not need to be updated as life expectancy and birth rates fluctuated. The 1935 law didn’t have any adjustment for inflation until COLA were added in 1975. I think that is going to be a fundamental disagreement between us which is fine. There is value in nailing down the exact and precise disagreement.