Contradiction with Exodus 20:13
Esther 9:27 involves the annihilation of enemies, whereas Exodus 20:13 commands, "Thou shalt not kill," promoting the sanctity of life.
Exodus 20:13: Thou shalt not kill.
Contradiction with Matthew 5:44
Esther 9:27 involves defending against and destroying adversaries, whereas Matthew 5:44 advocates for love and prayer for one's enemies.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Luke 6:27-28
Esther 9:27 describes retaliation against foes, while Luke 6:27-28 encourages loving acts and blessings toward those who oppose you.
Luke 6:27-28: But I say unto you which hear, Love your enemies, do good to them which hate you,
Contradiction with Romans 12:19
Esther 9:27 describes taking vengeance on enemies, contrary to Romans 12:19, which advises against personal vengeance, leaving it to God's wrath.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.
Paradox #1
The moral issue some might see is about celebrating a festival that commemorates violence and revenge. Some people might think it's inconsistent to celebrate an event involving such actions when many moral teachings focus on forgiveness and peace.