Why are you making this personal? I don't appreciate that, and I'm not going to answer your question from that standpoint.
One of the things that the discipline of psychology studies is human decision-making. It is well known that on the whole, human decision-making (ethical or otherwise) is grounded in heuristics. That's basically a fancy way of saying we use intuition and common sense, or quick rules of thumb to make decisions. We have these heuristics because the vast majority of the time, we have to make decisions quickly and either do not have access to or are unable to obtain the so-called "facts." Put another way, basic human decision-making and day-to-day living bears little to no resemblance to scientific methods that are fact-gathering tools. Fact-based decision-making is the exception to the rule with respect to human behavior. As it should be, given the analysis paralysis of demanding factual decision-making would be very problematic for most day-to-day tasks and living.
"Why are you making this personal?"
How on Earth can I possibility do that? I don't know enough about you to make it personal; my guess is you took it in a personal manner and now you are blaming me for doing so. Relax, it was just a question from some nobody on the web. I was merely trying to frame the question in a different manner, and it was never meant to imply anything negative about you.
"human decision-making"
A moral frame of mind is not made on the spot, as it is built over a life time. Do we sometimes act impulsively? Sure, but not always, and many times ethical dilemmas are something that have a long life in our personal and collective conscience.
As far as I am concerned, the link between good decision making and being informed is common sense. Had I asked, "Do you buy a used car without know anything about it, or should you try to learn as much as you can, so you can make an informed choice?" This would not be much of a debate.
I think people have a mental block here, because it ties science to ethics, and people seem to want to limit science from that scene. But being ill-informed when it comes to tough ethical dilemmas is just irresponsible and unethical. The truth is if you have a tough ethical conclusion to draw, and you don't turn to science when able and when it could help you reach the best possible conclusion, you are acting unethically.
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