Your hypotheticals are ridiculous. Whereas what God did was unnecessarily cruel.
Yes, they are ridiculous. This is a thread full of hypotheticals, mischaracterizations, and other tomfoolerry. You said you would never send a bear to kill a child...I presented a hypothetical (Adolph
Schicklgruber Hitler) to show the opposite is probably true...unless of course your interest in little Adolph's well being precludes the slaughter of 20+ million people.
Regarding the 42 kids mauled to death by the two bears: that account is in 2 Kings 2:23-25...they were part of a greater mob of children that was mocking and harassing the wrong person, no doubt reflecting their parents abusive attitudes toward a prophet of God. (they earlier tried to kill Elijah, but never mind that) On this occasion their disrespect was not tolerated.
If only their parents taught them better.
Perhaps you are simply unaware of the historical fact that many of these people were Baal worshipers, known to burn their own children to death in fire, introduced a civil war in Israel, slaughtered great numbers of God's people, that prior to this Elijah was under death threats and that they tried to assassinate him? Are you aware that this Elisha in question was being hunted down by a Syrian army at their behest? That they tried to usurp the throne of Israel and assassinate the rightful Jewish heir to the throne? The Northern Kingdom of Israel was already invaded and conquered and carried off as slaves, only to have their homes and lands confiscated by these people?
It's always good to bring the backstory into focus. Otherwise, how long was mocking, killing and enslaving God's people and prophets supposed to be tolerated?
TL; DR -
Their is a limit to God's patience. He will not forever excuse disrespect to his representatives. Juvenile delinquents are no exception.