If you don't already comprehend why parents allowing their children to play mature-rated video games (which by definition are not age appropriate for children) doesn't reflect well upon them as parents, then no amount of further explanation from me or anyone else will make you understand it.
Oh, Riley, you dazzle us all with your lustrous brilliance and simple, repetitious tactic of dismissal. Some facts from those of us who were actually there:
Alone in the Dark was released in 1992.
The ESRB was not fully developed in 1992, and thus confusing rating systems were in competition until the ESRB become the de facto standard. Most sources cite 1994 as the beginning of the ESRB.
And as far as I remember, AitD didn't even have a rating on the box. That was not uncommon for the time.
Ergo, were your general trolling comments about someone's failed upbringing by playing violent games valid on the logical grounds of the content of the game [which requires two assumptions - that no children can handle mature content which is in itself an entire debate and that failure in parenting can be attributed to one single act of allowing that mature content, which is flawed logic], they would still be 'moot' as you so eloquently like to say on the grounds that a comprehensive rating system didn't exist at the time - thus providing parents with no easy way to evaluate game content prior to purchase.
I look forward to hearing your typical, dismissive retort.