some point in our lives, we have all had our trust betrayed. There exist few of us who trust anyone implicitly. The same goes for principles or philosophies. We have trusted them, only to be disappointed. In the same light, we have followed religious scholars, only to find that they too have betrayed us - either by being undereducated or imperfect. Maybe that is why it is so hard for us to let go of ourselves and truly trust Allah.
When we start to analyze a command, we find in it things we can not explain or fully understand, so we stop doing it or do the thing which was forbidden to us, because the opposite does not make sense to us. Let me put that in more specific terms: We know that at the 120th day of life, Allah writes for us our sustenance (rizq).