Excaliber,
Don has some outstanding ideas. I would suggest looking at the cost of each of the injuries, both lost time value, medical expenses and paperwork for supervisors, vs the cost of a single pair of kevlar/spectra work gloves and a good utility knife. The cost differential should be stated as gross dollar value and percent difference, $200 for the injury vs $20 for the gloves and knife is 1000% cost therefore 10 workers could have been protected for the cost of the injury. This doesn't even consider the "cost" of the recordable on their OSHA 200 log.
If they ban knives then they have to substitute other tools to cut and strip things. They guy that cut his hand stripping wire with a pocket knife wasn't doing his job properly since wire strippers are cheap and readily available. Nor was the guy using his knife as a pry bar. Are there proper tools for performing those task? If so then I'd log the injuries, interview the workers to find out why they didn't use the proper tools that the company provided and have them participate in "lessons learned" sessions with the other workers in which they explain how they got hurt and how it impacted them. If not, I'd make sure that the company understood the financial impact of not providing the proper tools for these simple tasks and point out that all of it could have been prevented with a few hundred dollars in proper equipment.
Each workmans comp case like this costs a company hundrends of dollars of insurance, lost time and paper work. The losses from the 200 log can be much greater since the government and other large buyers look at the 200 log and workmans comp ratio to help them decide whether or not to purchase from a company.
The bottom line is, it costs a company less in the long run to supply the proper tools and training for it's workers than paying for workmans comp claims. If they ban personal knives then they need to supply proper tools to perform the job. On the other hand the workers are the only ones that can work safely and have to use the tools provided to do the job safely or insist on proper tools to do their jobs safely.
Take care,
Mike