If you're referring to humankind in general, yes, I think conflict is inevitable. We are all different, so inevitably, we will have conflict with someone over something, whether it is something minor or major. Can we learn to deal with conflict better? Absolutely! However, is conflict inevitable? Yes!
In reference to The Crucible, the conflicts that develop in the play stem from, superstition, a misunderstanding, guilt, revenge, and individuals consumed with a sense of total authority over their fellow man.
"I have seen too many frightful proofs in court - the Devil is alive in Salem, and we dare not quail to follow wherever the accusing finger points!" Act 2, Scene 3, pg. 68 (Miller)
This quote by Reverend Hale is an example of both superstition and fear that dominated the lives of the people of Salem during the witch hunt.
"Do you take it upon yourself to determine what this court shall believe and what it shall set aside? . . . .This is the highest court of the supreme government of this province, do you know it?" Act 3, Scene 1, pg. 79 (Miller)
Deputy Governor Danforth has positioned himself as the highest authority, giving him the right to identify evil in Salem and declare it witchcraft.
Human existence will always contain conflict. It will be between the governed and the government, the individual and society, the husband and the wife, the parent and the child and so on. Ideas, beliefs and perceptions are unique, there will always be differences in my view. As long as there are differences, there will always be conflict.
(The Crucible, By Arthur Miller)