Why do these things happen?

There were some present at that very time who told him about the Galileans whose blood ^pPilate had mingled with their sacrifices. 2 And he answered them, ^q“Do you think that these Galileans were worse sinners than all the other Galileans, because they suffered in this way? 3 No, I tell you; but unless you ^rrepent, you will all likewise perish. 4 Or those eighteen on whom the tower in ^sSiloam fell and killed them: do you think that they were worse offenders than all the others who lived in Jerusalem? 5 No, I tell you; but unless you ^rrepent, you will all likewise perish.”