Post 3 is closer to the fact of the matter. Yes, the employers cared about the employees, because the labor of those individuals was the way in which the company made money. If your question had asked, "Did the employers in the Triangle Shirtwaist fire care about their employees as people with rights as human beings," the answer would have been no.
The owners thought of their employees as labor, nothing more. Their decision to lock them in was to maximize efficiency and, as post 2 points out, to minimize losses due to theft. Their policies demonstrate that they regarded their employees as units of labor to be squeezed for every cent they could, not as human beings with rights.
It's awfully hard to imagine arguing that the owners cared about the employees. After all, they locked them in this sweatshop so that they couldn't steal things or take breaks when they weren't supposed to. Then when the fire started they ran away and didn't really try to save the workers (not sure what they could have done, but still...). Locking the doors to the fire escapes hardly sounds like the action of a caring employer.