I would guess the "reckless" definition may relate to the Judge's instruction on whether he "knowingly violated" a duty of care to the welfare of children. If the prosecution failed to show that Spanier had the criminal intent to satisfy the standard of "knowingly violated", the Judge may have instructed that this could also be satisfied by showing his actions were so reckless that it amounts to "knowingly violated".
Great points....like someone speeding in icy weather. Perhaps it was on purpose (to endanger a child) but by reckless disregard.