You are salt. You are to salt society, to preserve and protect it as salt protects meat. It is so easy to be overwhelmed by all the wrong and evil and misguided brokenness which seems to spring up like hated weeds in every corner of what once was God's perfect paradise garden called earth. It would be so easy to throw up our hands in despair and throw in the towel and dash into a safe cocoon of our own little life with our own little family and our own little church community where we know the boundaries and can keep a careful handle on things and control the environment and feel at least some measure of security. There is no use evangelizing or working for social reform or assisting those in material or psychological or spiritual need because it won't do any good anyway.
Evil is too overwhelming.
For as was the case with Abraham, we that know the will and plan of God for the future of this world cannot go into hiding. We are called into this world as a PART of this world. We have to live with and reckon with this world. In addition that, we have always to remember that evil is not the ultimate judge of the course of events. And God does not act on his own in some harsh, preconceived, inflexible manner.