>Why do people need someone to train them?
You should be asking the other question. People don't realize how poor professional IT training is.
All APS[1] registered psychologists have to do 10 hours of formal training a month. It's mandatory to keep your accreditation. Employers give them the time off, and pay to send them to seminars on the latest developments in the field.
About a quarter of a specialist doctors job is to stay up to day with the field. Hospitals bring in experts to lecture and send their staff to conferences. They have to, especially in the USA where healthcare income is proportional to success rates.
The same is true for lawyers. Good lawyers must keep up to date with the latest developments in their countries case work, and again, legal firms that hire their lawyers on a salaried basis expect them to spend 30-50% of their time just reading case reports.
It's pretty much only IT that expects it's employees to keep track of a fast-developing field in their spare time. So a) I don't think we're due anything less than anyone else and b) you're inevitably going to see some pretty serious attrition if you ask people to choose between a family/social life and their career.
[1] http://www.psychology.org.au/