Well, try to remember that for Alan, inheritance is at most an optional feature of OOP, so maybe those "5-10 level deep inheritance trees" aren't as much about people drinking the OOP "cool-aid" as you think.
Both simual and smalltalk inheritance was added later in the languages history. Yes its optional but it doesnt stop people making a mess of things when they categorise their objects based on data type instead of behaviour
Nothing can stop bad programmers from writing bad code. Take OOP away from them, and they'll just write bad procedural code or bad functional code; their bad code is not a stain on the paradigm they choose to abuse.
