For your first sentence, I would rather say that they DON'T want to think when it comes to computer/maths/etc. "I don't like it, hence I'm not good at it." giv

For your first sentence, I would rather say that they DON'T want to think when it comes to computer/maths/etc. "I don't like it, hence I'm not good at it." gives them an easy reason to avoid the problem.