This is gonna be quick I hope.
It is necessary for any species of self replicating organism to have some method of determining conditions which can extinguish it.
Consequently we must have individual pain and suffering or else we die out as a species.
It is also possible, for the sake of this arguement, to regard our societies, whether they be family, tribe or nation as organisms, the difference being that they are brought into existence by the use of intelligence which is a survival mechanism adopted by humans. Since they are "organisms" they also must have some method of determining conditions that can extinguish it, and with it, its members.
Consequently humans, wolves, amoebae, and bacteria all must feel pain and hunger for that is the only method worked out so far to insure the avoidance of things that will kill us and acceptance of things that will benefit us.
Suffering requires intelligence and imagination to exist as part of the human condition. ie. fear.
If we did not "fear" pain then we would be very likley to perform acts that would kill us.
So since the formation of societies is a survival method adopted by "intelligent species" we will always have some form of competition.
Currently it is "wars and rumors of wars".
Hopefully an intelligent species can find a better way.