Do you take every Biblical passage so badly out of context? How about "covet thy neighbor's house"... is that a proper citation? It's surely in there!
Here's the entire passage (Matt. 7:1-5).
Judge not, that ye be not judged. For with what judgment ye judge, ye shall be judged: and with what measurement ye mete, it shall be measured to you again. And why beholdest thou the mote (speck) that is in thy brother’s eye, but considerest not the beam that is in thine own eye? Or how wilt thou say to thy brother, Let me pull out the mote out of thine eye; and, behold, a beam is in thine own eye? Thou hypocrite, first cast out the beam out of thine own eye; and then shalt thou see clearly to cast out the mote out of thy brother’s eye.
It does NOT command Christians to never use their judgement. It's a warning to people to be careful that they do not make hypocrites of themselves in their critiques of others, and to concentrate on their own behavior more than others. It's not an admonition to never think critically. In fact, at the end, it explicitly says that you can "remove the mote" from your brother's eye, once you have cleaned out your own.