Indifference will not do. Jesus rebuked the villages of Chorazin and Bethsaida, even though they had heard the good news and experienced the wonderful works which Jesus did for them. The biblical word for woe is also translated as alas . It is as much as an expression of sorrowful pity as it is of anger. The people who heard the gospel here very likely responded with indifference.
Repentance demands real change both a change of heart and way of life.
God is ever ready to give us new hearts and renew us in his love and power. Jesus' anger is directed toward sin and everything which hinders us from doing the will of God. In love he calls us to walk in his way of truth and freedom, grace and loving-kindness, justice and holiness. Jesus assures his disciples that no power on earth or in hell can keep them from him. God entrusts each of us with his word and Spirit and he wills to work through and in us for his glory.