There are a lot of reasons you might, here’s a decent article on it:

https://www.psychologytoday.com/intl/blog/strategic-thinking/201303/why-we-ignore-good-advice?amp

If my only options are literally (I’m assuming cooked) pasta plain, or with ketchup added, I’d 200 percent eat just the pasta.

If it’s Disney without DRM it’s probably a bootleg DVD

Yeah, an already ripped DVD or a non DRM protected DVD, which is as difficult as copying files from a USB and why dd works here.

Yeah this won’t work with 99.9 percent of DVDs or Blu-ray because of the DRM and the way the drives behave, not sure why you’d even post this.