There are many of the 613 positive and negative commandments that
make NO SENSE (red heifer is the classic example). They are called
"chukim" - ie; we are not supposed to understand the reasoning behind
them.
HH: Doesn't "chukim" refer to the plural form of
the Hebrew word for "statute, ordinance, decree"?
I am familiar with this way of looking at such
regulations of the law, but it may be that we have
lost some of the meaning that the institutions
had for the ancient Israelites, such as the reason
why it was a heifer and not a bull calf, and the
demand for the red color. Parts of the ordinance
are quite comprehensible, enough for us to find
the law meaningful, even if we do not grasp all
the details.