A parent does not value anyone's life as priceless, not even their own kids.
If they did, then the parents would never go on vacations, never take time off. They would be willing to work 120 hours a week 7 days a week (about 17 hour days) (if it benefits their kids even slightly).
They value the lives of their kids as valuable, but not priceless.
It's a hard pill to swallow, but it's the truth.
I also don't understand it why parents take it hyper personally if you insult one of their kids even accidentally. People deliberately insult Donald Trump all of the time; it's not like Trump's dad is mad at democrats for hating his son and even going so far as to incarcerate his son.
People insult Hunter Biden all the time; Joe Biden doesn't care. Maybe there needs to be a maximum age for people to actually care; people insult Greta Thumberg when she was a minor; her parents don't care.
Everyone is fair game if society respects the 1st amendment, including other people's kids (which is everyone since we are all somebody's kid).