Hmmm.
I guess the first question is: Just what do you have in mind when you say “teach”? Ethics textbooks? Tests? Instructional plays? Group discussions?
Are we talking grade school, or what?
Are you assuming that persons who behave in a manner that you (or nearly everyone) calls “immoral” do so because they’ve never been taught that such-and-such is “wrong?”
We already have morals/ethics instruction, 24 hours a day, 7 days a week. It’s called television. Nearly every episode of nearly every program inevitably takes the form of a little “morality play.” Some of these are quite sophisticated, like the recent “Without A Trace” dealing with the spectrum of moral conflicts arising from the present anti-terrorist campaign.
I suppose asking even grade school students to identify the basic moral conflicts in a given TV episode could be a good thing–in theory. The problem is that clever young minds are always on the lookout for new ammunition to use against whatever rules their parents have imposed on them, and fostering an awareness of life’s moral ambiguity at too early a stage may just make budding con artists better con artists.
Homosexuality? Abortion? Can there be any plausible kind of “moral instruction” in these areas without either attacking or defending specific doctrines of specific religions?
Chastity is no less enmeshed in religion.
One ends up with stuff like “telling the truth is better than lying” or “don’t take other people’s possessions” or “don’t hit somebody without a good reason.” I think the kids already know these maxims.
Schools, and teachers, ought to be living examples of goodness: honesty, fair-dealing, forebearance, kindness, patience, courage, respect. The rules of the school ought to promote these things, and ought to be EXPLAINED in such terms, not merely in practical terms. If students can not be “made moral,” perhaps we can at least impart to some of them the idea of moral goodness itself as something distinct from, and inherently superior to, morally uninformed practicality.