That sounds like a very slippery argument, but no, the way to solve knife crime is not to ban knifes, it's to understand and "fix" the reasons (systems) why people do knife crimes in the first place (e.g. poverty, poor mental health resources).

In this case, we need to understand how the systems (e.g. the API) allowed for this to happen, and perhaps yes, get rid of it (or perhaps some other solution, I don't know, but beyond CA it seems that even a "legitimate" use of the API can easily cause harm).