Jesus again in reply spoke to them in parables, saying, "The kingdom of heaven may be likened to a king who gave a wedding feast for his son. He dispatched his servants to summon the invited guests to the feast, but they refused to come. A second time he sent other servants, saying, 'Tell those invited: "Behold, I have prepared my banquet, my calves and fattened cattle are killed, and everything is ready; come to the feast."' Some ignored the invitation and went away, one to his farm, another to his business. The rest laid hold of his servants, mistreated them, and killed them… (Mt 22:1-14)
Kingdom of heaven is like a wedding feast. There is a celebration. Here feasting and celebration are not the most important things. But the invitees are the central points of the story. Kingdom of heaven has its relevance only if the people are there. Celebration will not go on with out the people around. Bride groom may be there and the bride also may be there but if the invitees are not there then there is no celebration.
Those who were invited were not worthy. There were not worthy not because they have not done anything (or done anything wrong) rather they did not join in the celebration. Their moral status was not discussed rather their presence was the most precious thing at the celebration. All what they have done (ignore, ill treat the servants etc) were only signs of their refusal of the invitation.
The celebration needed people because the time for the celebration was at hand. Everything for the celebration was ready except the invitees. He gathered the people from all over. Anyone and everyone are taken in. Because the celebration should go on. The servants were asked to gather the good and the bad. Only thing is that htey have to be worthy for the celebration.
