Alma 23:14

And the Amalekites were not converted, save only one; neither were any of the Amulonites; but they did harden their hearts, and also the hearts of the Lamanites in that part of the land wheresoever they dwelt, yea, and all their villages and all their cities.

We should choose our friends carefully. Be familiar with all, but be careful about those we keep closest to us. When everyone around us thinks and acts a certain way, it is hard to go against the tide. They seem right simply because they in the majority, and we may be cut off from other points of view. Of course, it works both ways. We surround ourselves with good people and their goodness rubs off. Ultimately it is not their fault, however. We make the choice, and we reap the consequences. Everything in our lives leads back to agency.

Mosiah 17:12

But the priests lifted up their voices against him, and began to accuse him, saying: He has reviled the king. Therefore the king was stirred up in anger against him, and he delivered him up that he might be slain.

We ought to be careful about the people with whom we surround ourselves. Noah chose wicked men as his counselors. When he might have done the right thing, his friends talked him out of it. It is hard enough to walk the strait and narrow path of discipleship when your friends are cheering you on. It is impossible when the people around you intentionally try to steer you in the wrong direction. We are to be familiar with all and a genuine friend to every person. But we must be careful who we listen to.