First - I was quoting the article.
Second, comparing Gravity and the effect of minimum wage is silly - Newton's "LAW" of gravity is completely empirical - there was no theory at all - no reason why gravity occurs, it just did, and it follows this equation.
So, minimum wages have different effects depending on the circumstance you are looking at. It seems reasonable to look at what minimum wages do to the economy.
I agree that morally minimum wages are wrong. But so is government assistance to corporations. If you want to go from here to where we want, you are going to have to understand how the immoral world works, unless you expect the world to just change overnight.