They themselves do not have standards. Not only do they not have standards but they have perverted principles. They are unscrupulous. God does not want us isolated from the world but insolated from its influence. We are in the world but we are not of the world.
Darkness is where the light is needed.
Therefore, Christians should not be religious recluses. God's sovereign plan is to use his people to reach distorted people. An attitude which militates against sharing our faith is that people with twisted thinking will never be open to receive Christ. However, these are the very people, God's says, to whom we are to witness. The only light this world has is the believer.