Matt 14:8 So she, having been prompted by her mother, said, “Give me John the Baptist’s head here on a platter.”

John’s preaching had offended the entire family.
Herod had taken his brother Philip’s wife.
Notice it says wife and not the ex-wife.
This is a case of adultery and Herod and Herodias are guilty.
Herodias is the granddaughter of Herod the Great and Philip is her half-uncle.
Now she is with Herod Antipas, the son of Herod the Great.
Herod the Great is the same that ordered the killing of the children after the visit of the wise men.
He is from Idumea (Edom) and therefore not a Jew of the lineage of Jacob but an Edomite from the lineage of Esau.
Herodias hated John for calling her relationship sinful.
So she had her daughter, Salome, dance for Herod and demand the head of John as payment.
This did not change her adulterous relationship.
In fact, she just added murder to her list of sins.
Many people go to church and hear a message that makes them uncomfortable.
They hear that what they are doing is sin.
Their solution: don’t go back to church, effectively beheading it from their lives.
The problem: it doesn’t change the message of the word of God – we are still sinners.
God’s solution is to listen to His word, repent, and accept Jesus as your savior.