What are some examples from The Adventures of Huckleberry Finn that support the theme that is central in this novel which is "Man's Inhumanity to...

One example is clearly represented by the scandalous,
base, and criminal acts of the "king" and "duke". They are both in a constant quest for
self interest and self gain, without taking into account other people's
losses.

We can see another example in Huck's father abusive
treatment: he prohibits Huck to ever go back to school, he compels him to provide him
with money, and he even kidnaps him, overlooking the law, and forces him to go live with
him.

A third instance of inhumanity we can observe in the
crowd's reaction when they find Jim. They want to kill him, publicly humiliating him so
that he will serve as an example for other black people who want to run away. The
crowd's attitude signals a readiness to judge people in a very hasty way, without
hearing their defense first.

Another example is depicted in
Tom Sawyer's thoughts about how Jim has to suffer like a real prisoner. Tom even
considers the possibility of sawing Jim's leg off instead of just sawing off the bed's
leg. Besides, Tom makes Jim's life more uncomfortable by bringing into the cabin
spiders, rats and snakes. This shows a serious lack of sensibility in Tom towards other
people's feelings.