Ten Bears in a Bed

Ten bears in a bed and one got a gun,
just enough room for American fun.
He growled and glowered "We will be fine."
"I protect mine," and then there were nine.
Mama Bear broke a plate and then there were eight:
she made room in Heaven and now they were seven.
"You'd best take your licks," the bear sneered, and then six.
They still could have thrived, but suddenly five.
One ran for the door, and then there were four.
He looked at his daughter, she could make more.
But she tried to flee, so then there were three.
He still wanted room, so he took it to two.
His own eyes in his son, he could not make it one.
But the boy played the hero.
And now it is zero.