Why is real magic not a good illustration to realize Truth?

Many monks achieved various levels of perfections and some were extraordinary by human standards like passing through walls , walking on water, levitating in the sky, dying then arising etc... If Monks have compassion , which they have , then why don't they show us or show me the magic which they perfected? Because if they show me some real magic then my belief on the permanence of physical laws will vanish. Mostly I believe in the permanence of physical laws like no person can go through wall or that what will go up will come down or that if slapped I will be in pain...and so on... This belief in permanence of physical laws came into existence in my consciousness as given the exact causes exact similar things were happening since I took birth. Real Magic will break that belief. And once I my faith in the absoluteness of the laws of Universe is broken I will start questioning the reality. I will start asking what all in not permanent ? I will start wondering if Universe doesn't work by those laws then which laws ? Should I conclude there is no permanent law ? Desire for investigating will develop as desire of investigation is one the 7 factors of awakening. Therefore for the sake of humanity why don't Monks show magic and convert the lay people into Buddhism? In short ,why real magic is not a good illustration to make one realize the Truth of impermanence of all physical Truths.?