These verses contain the interpretation or allegory of the parable of the weeds and are found only in the Gospel of Matthew. Since Jesus speaks to the crowds only in parables, Matthew has Jesus go into the house after leaving the crowds and explain privately the meaning of the parable to his disciples. In the interpretation, the attention is on the weeds and so on the final judgement. The Son of Man has indeed sowed good seed in the field, which is the world and not merely the church, but the devil who is responsible for the second sowing has sown weeds. Though this is the case, it is not the believers who represent the good seed who will pass judgement on the unbelievers who represent the weeds Judgement will be passed by God through the Son of Man.
We sometimes wonder why “evil” people seem to be thriving. When we do this we are already making a judgement about a person or about something, which we might not fully know. If we avoid comparing ourselves with others and stop labelling them especially when we are not fully aware of the facts, we can concentrate better on what we are called to do and be.