Some people oppose legal recognition of conscientious objection even for military service and conscription, arguing that all citizens are obliged to serve in the military when the country requires it, and that nobody should be able to expect special treatment on conscientious grounds.
Opponents of legalizing conscientious objection argue that everyone is required to serve in the military when their nation needs it, and that individuals shouldn't receive preferential treatment due to their religious or moral objections.