Often , enemies are loathed , castigated and condemned as bring the sources of our myriad challenges in life. But it should be noted that " enemy " as used here is not limited to human beings; it is inclusive of other phenomena which we have so tagged because of our subjective perspective.
In this wise " hunger " is an enemy as your " critic". But both are indeed your friend; partnering with you for progress.
Hunger drives you to imbibe the necessary nutrients for your mental and biological sustainance, even as your critic would force a second review of your condicts towards improving them for your betterment.
As ' bad' as friction, without it motion is not possible, so friction is a friend , not a fiend!!
As ' bad' as gravity, always pulling you down, without it you would float aimlessly without bearing. Gravity is a friend therefore; not a fiend!!
Without, restrictive laws, by governments, there would be anarchy as there wouldn't be a free for all skirmishes. Thus the laws are your friends , not your enemy!!
I am aware you have a list , longer than mine of such circumstances, considered as enemies, but are not.
You may please list a few here as comments to enable Steemians have a proper perspectives about them!
Do you consider this not necessary? I oppined otherwise. Just list them all the same, and be marvelled with the attendant reactions!
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Wouldn't you rather aid our grow by Upvoting and Resteeming us 
