Adam Clarke on Proverbs 12:7

The wicked are overthrown - Seldom does God give such a long life or numerous offspring.

But the house of the righteous shall stand - God blesses their progeny, and their families continue long in the earth; whereas the wicked seldom have many generations in a direct line. This is God's mercy, that the entail of iniquity may be in some sort cut off, so that the same vices may not be strengthened by successive generations. For generally the bad root produces not only a bad plant, but one worse than itself.