Take a quick peek at Matthew 15:12-14
12Then came his disciples, and said unto him, Knowest thou that the Pharisees were offended, after they heard this saying?
13But he answered and said, Every plant, which my heavenly Father hath not planted, shall be rooted up.
14Let them alone: they be blind leaders of the blind. And if the blind lead the blind, both shall fall into the ditch.
This explains better the parable of the wheat and tares. Jesus told his disciples to leave the tares alone
28He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?
29But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them.
30Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.