Stock cage or aftermarket cage, the argument could continue forever but the reality is that no amount of protection, signs, videos, warnings, etc. can or will suffice for every type of accident or Darwinesque move imaginable. Common sense must prevail. Thoughts and prayers to the friends, family and those involved in this lapse of judgement than can never be undone.
Unfortunately, we're our own worst enemies when it comes to incidents like these as big brother and others that know what's good for us are ready and willing to pounce and write new laws in an effort to curtail our freedoms to keep us all safe from everything imaginable.