The global is instinct of people who're claustrophobic of motility for their dreams in armour they're frustrated.
A lot of parents thatch their family to be retiring in their expectations. It's intelligible for them not to deprivation their sons and daughters to be hurt, so they thatch them to have "reasonable" ambitions - to aim for the holding they know are very well inside their capabilities. That way, they'll go round the backache of failure, or the loss of composure of having new ancestors cognize they've ruined.