Because the current capabilities are insufficient, yet people are using those capabilities as if they are self-driving options. So when Tesla owners get overconfident about their assisted driving mode it ends up adding to the problem.

I even saw a video where a Tesla owner was letting a Youtuber drive and tried to goad him into leaving the car in assisted mode at a dangerous intersection, just to "see what it would do." I think the Youtuber was wise to not do that.