If you promote something as "autopilot" and "full self driving" and "safe" and yes sure the fine line says you need to stay alert and ready to act in under two seconds but the marketing really implies it's just a regulatory thing, and then you have said system kill people because it's not self driving at all it's drive assists, then people lose confidence.
Hell, even people who are fully aware of that are getting worried now, not because they don't understand what it is or isn't, but because they worry the person behind the wheel might be misunderstanding.