It ignores the simple economic principle of the division of labor and indicates a breakdown in social trust.
It's too bad many of us have no other choice.
terribly
If economic efficiency was the only criteria, given my opportunity costs, it is less expensive for me to hire a high school student to educate my child than for me do do it myself.
But speaking of efficiency, while in theory we should let professionals handle this, in some urban school districts it costs IN EXCESS OF ONE MILLION DOLLARS to graduate a single child who is competent at their grade level in all required subjects.
The goal of our family effort was first to convey godly values to our child and to help them to develop the character that would serve them well in life. Secondarily was book knowledge. The former was a parental obligation that cannot be subcontracted out, especially to people who as a self-selected profession are hostile to godly values. [see 1]
[1] TEACHERS GROUP RECRUITS BILL AYERS FOR CONFERENCE KEYNOTE, http://www.theblaze.com/blog/2013/01/18/teachers-group-recruits-bill-ayers-for-conference-keynote/