[whythre]

Biological weapons are less ethical because the chance for collateral damage is far higher. Weapons like railguns and lasers may be destructive, but they are far more precise than biological agents- the main feature of the biological weapon is its infectious nature. Even if a laser missed an intended target and harms a bystander, or strikes an innocent due to bad intel, that is still a contained tragedy.

Biological weapons can mutate or spread in unforeseen ways to infect victims other than initial targets, and a virus or bacterium does not destinguish between combatants and non-combatants. A biological weapon can cause suffering on a much larger scale than the initial deployment of the weapon, which is why they are widely banned.

[WHATDOESIT]

Very good point that I didn't think of, thanks.