Wrapping one thick rubber band around the top half and one around the bottom half helps a bit as it gives you a grip. I'm not sure the knife will work. I'm stressed every time trying to open it. I agree it is a joke, particularly as the company must have an incredibly lucrative contract...
I have this problem every time. You need to have very strong wrists and hands. In my opinion this is a design fault. There is no consideration for people with arthritis or other physical difficulties.