that's a strange take to me, like why say it? the kid will spend 99% of their formidable time with the parents. sure, baby sitting, grand parents, and over time other external influences creep in, but why turn this into a "yes, but"?

especially when these influences absolutely don't have equal weight.

It’s his opinion because it excuses his own poor behavior. It’s impossible to get it perfect and everyone else does it so why would I even try?