Because Twain's writing is very inspiring and encouraging
Answer:
Normally its the pleasure of doing so or they are just in need of something (i.e. robbing a bank-in need of money). Most people who do something wrong to get something they want do it for the thrill or the pleasure.
According to the definition of restrictive clauses, it is a clause which hides possible meaning of preceding subject by limiting it.
And with its definition we can easily determine the needed clause in each sentence:
1. <span>The girl with the golden hair is the one we are looking for.
2. </span><span>The dog that ate my homework is called Henry.
</span>3. I’m saving the muffins that have cherries<span> for my sister.
4. The smile that she gave them was beautiful.
As you can see it can pose as characteristic of a subject in some measure.
Do hope it will help you!</span>