Right or wrong does not come into it at this stage. If there is a legislature then there is a controlling influence behind an army. Without that there is anarchy. In an anarchy, the very evil, covetous influences that an army suppresses, can rise to the fore and become the Hitlers and Stalins of their era. The issue of death and injury is pivotal to the case for the armed forces.
Lets look rationally at who is killing who.
A knowledge of the Geneva Convention and Rules of War is essential here. So it is legal for a combatant to kill or attempt to kill a combatant. This brings into question the phrase legalised murder. I cannot do it myself - I am not trained. This is where death, injury and damage are caused against non-combatants.