For me (and some people at the time), the Triangle Shirtwaist fire is an example of the types of abuses that can happen in a capitalist system where workers are essentially viewed not as humans but as units of labor. Striking the right balance between regulation, which is necessary, and the need to create jobs is indeed an unsolved problem. The owners of the factory were almost completely unrepentant, and indeed their lawyers completely humiliated some of the survivors of the fire. One of the owners was even cited for locking doors and windows at another facility later on. We can't force business owners to pass an ethics exam before we place the lives of workers in their hands, so unfortunately I think the power of the state has to be used to protect the basic humanity of labor, and of course, part of this includes protecting the rights of workers to unionize.