and we can't possibly think in shades of grey or make exceptions where needed.
Ever heard of the Ptolemaic model of the world? It seemed correct, but new and new facts required more and more exceptions until collapsing under their weight. Once you begin talking about "shades of grey" and "exceptions where needed", you admit, your model is junk...
And surely stuff like a bunch of women unionizing will all be an evil bunch
The workers wanting to bargain collectively aren't evil — they are doing, what's best for them. What is evil are the laws, that recognize unions as anything more than a group of people willing to associate with each other... No such laws should exist. A "union" of New York City transit workers should have no more legal recognition, that the community of Slashdot posters.
Moreover, given that unions are organizations set up with the explicit goal of maintaining and raising the price of what their members are selling (their own labor), they should be viewed as monopolies, subject to "trust-busting" laws.
If Staples and Office Depot were prevented from merging with each other for fear, the price of office supplies would go up, why do we allow our supply of healthcare, education, transportation, as well as crime- and fire-fighting to be controlled by the price-fixing monopolies?
Wake me up when you have an argument that actually applies to genetic testing
My argument, for the last time is that we are all employers, and, when considering any employment-regulating law (such as the ban on the use of genetic-testing by employers, implicitly suggested at the top of this thread), we should apply it to ourselves from the other end too: do I want this (or similar) law to control my interactions with all these people I hire: food takeout, gardener, nanny, cab-driver?
For a particular example, I don't want my nanny to have above-average incidence of sickness — even it is not contagious — because, any time she can't show up, I have to skip my work. So if, when interviewing candidates, I can quickly check their health, I'd want to be able to do it. This makes me sympathetic to the other employers wanting healthy employees. Someone of poor health may try to compensate with something else (higher productivity, better education, willingness to accept lower pay, whatever), but any bans on the use of any criteria are just that: Illiberal.