To a mouse vs. of mice and men

To a mouse was a poem about how anything that one works hard at can be destroyed, whether it is a mouse's home or a country's economy.  I think in Of mice and men, several things were worked hard on and got destroyed, which is why Steinbeck named his book of mice and men.  I think one of the things George worked hard on was Lennie, who eventually died.  George took care of Lennie, made sure he had food and work and made sure he was safe.  George had done that for so long and worked so hard but when he shot Lennie, all his hard work was kind of for nothing.  I think the title suggests how mice and men are similar in a few ways and maybe in the 1930's, that title made people think about their own lives.  I think in general, Steinbeck was trying to say to value life, even when times are tough like in the great depression.  I think he was trying to say when the thing that you worked hard on gets destroyed, you have to move on.