That is the problem with the WTS approach. They want you to be open-minded and question everything when you are not a JW, then they want you to have unquestioned loyalty and obedience when you are.
They try to hide it a little bit- the approach is "test the things we tell you and you will see that they are true." Not 'test it to see if it is true' but 'test it and you will confirm it is true.' If your test does not confirm that what they tell you is true, then you had better test again and again until you see the truth of what they are saying. Otherwise you risk removal.
When you are in and determined to stay in, you can gloss over the contradiction. But it doesn't go away. Every time you see/hear a JW reject any non-WTS literature or discussion because it is dangerous to read or listen to, you wonder why someone who has god's own truth would be afraid to confront the devil's lies. In order to continue to remain, you have to lie to yourself. At some point you either confront this problem or you bury it.