Contradiction with Matthew 5:9
This verse speaks of peacemakers being blessed, which seems to contradict the anticipation of wars and commotions mentioned in Luke 21:9.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with 1 Thessalonians 5:3
This verse mentions a false sense of peace and safety before sudden destruction, contrasting with Luke 21:9's warning not to be terrified by wars and commotions.
1 Thessalonians 5:3: For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.
Contradiction with Isaiah 2:4
This verse speaks of turning swords into plowshares and nations not learning war anymore, which opposes the idea of ongoing wars in Luke 21:9.
Isaiah 2:4: And he shall judge among the nations, and shall rebuke many people: and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up sword against nation, neither shall they learn war any more. [pruninghooks: or, scythes]