As long as employment is voluntary, and the employees are adequately informed about conditions, and the employees have protection for speaking out ("Free speech" in a business environment - what a concept!)
The problem is that they don't.
Given the above (no fraud, etc. from the employer) it is the employee's choice to work in such an environment. This is like people choosing to ski, kayak, snowboard, parachute, etc. Also note that the "safety laws" are to prevent employees from doing stupid, dangerous things - to themselves and other employees. It is the individual's responsiblity to not get themselves into dangerous situations that would result in injury or illness or long-term damage to hearing, etc. If they do, it is their own choice and their personal responsiblity - again, what a concept.
Indeed it is their own personal responsibility if they are made fully aware of the risks.
If a person, and I've known many such as this, who chooses to work in a noisy, dusty, toxic environment without using the provided and even mandatory personal protection equipment -- then it is their own darn fault and responsiblity for being, in old age, hard of hearing and with clogged up lungs, and skin problems. That is why "Material Safety Data Sheets" (MSDS's) are to be available to all who handle a chemical.
Indeed and this is why the laws exist. If the employee chooses not to use the safety equipment provided by the company then he deserves whatever he gets. However if he is not told about the required safety equipment and none is provided for him then I would put the company at fault.
I had an experience this summer where a fellow employee was negligent and put us all in danger. Though the employer had been told, we should have taken the responsiblity to say sooner that we will not work with that person. We didn't and thus, really, it was our fault for the equipment damage and the very close call to injury.
It was the fault of your coworker for being negligent. I wouldn't say it was your fault for the equipment damage caused by your coworker.