Feel free to refute my minimum wage example for starters. Here's another:

  1) you want to help the poor
  2) you confiscate wealth from other people, and give it to the poor
  3) you have just removed money from the economy 
     and caused it to get used much less efficiently 
     than it would have, and demotivated lots of people 
     from doing business and producing value 
     to the world at large.