In the AV/KJV, but not in the ESV?

Why has a crucial text in the Gospel of mark been removed by the modern translators of the ESV, thus loosing an important message of Salvation to the readers?

One has to wonder how much more of the Bible is to be changed to satisfy the selfishness that is entering Ekklesia in relation to justifying conduct and life style to fit in with the ideology of the world and the loss of an important message that our Lord was warning if lost cannot be got back again!

Matthew 5:13, Mark 9:50, Luke 14:34, Colossians 4:6.