A necessary evil is still evil. Likewise the fact that coercion by civilian government may be necessary does not make it good. It is still at best a necessary evil. Remove the necessity and all that remains is evil. The only justification for any government activity is necessity.
Coercion is to human relationships what salt and water are to automobiles.
The more brine we pour on those relationships the more they corrode. Even popular government actions are coercive to some. If everyone was a willing participant, government involvement wouldn't be needed. The more activities government undertakes, the more people it coerces. The cumulative effect of the coercions builds frustration and alienates the citizens from government and from each other.