How does Twain express his skepticis toward men who claim to be "reformed" and those who push to "reform" others?

Pap manipulates people who are weak minded. The new judge then sympathetically takes Pap into his home, dresses him well, and tries to reform him. After thinking that he has reformed Pap, the Judge goes to bed. That night, Pap sneaks out of the new judge's house and buys some alcohol. By morning he is so drunk that he breaks his arm in two places and nearly freezes to death on the porch. The new judge is livid at this betrayal of his trust and comments that the only way to reform Pap is with a shotgun.