When will we learn?

All it takes is a little history lesson. Consider the steel industry, the airline industry, and now the automobile industry. Unions killed them all. The teachers have also used unionization to kill our education system and our federal workers have crippled our government agencies. Most of the damage is not as obvious as the industrial corpses, but the havoc is there nonetheless. Liberals still insist the unions prosper at the expense of the workers they presume to represent and an all the rest of us as well. When will we learn?