What you are saying isn't untrue but it is purely pragmatic and still lacks a particularly moral rationale.
Discussion
It is the rationale but is perhaps pragmatic in that it is matter of fact.
Destroying life is immoral on this basis, unless it is in defence of life.
Interestingly murder is based on the false premise that value can be gained through destruction as opposed creation. For example, war does not increase value (perhaps looting does in the short term), trade does.