I think from the contemporary Egyptian point of view Moses probably WAS treated like a lunatic--he gives up a cushy life as an adopted member of the royal family to fight and live with slaves. Without the faith of a true believer and an understanding that he is following the will of God that wouldn't make much sense.
I'll go a step further in the same direction: if Christ is not true, then every Christian lives like a lunatic -- and those who don't, aren't doing it right.
Dan