Border and Customs Protocol?

I just returned from a vacation in Canada. At their Customs I was asked, Where are you from, Where are you going, Why are you coming here, How long are you staying and they took my picture. All of this was after about 6 people had to see my passport.
They even took some people's finger prints.

I am a legal US citizen, with no arrests and a legal passport.

Also, when returning to the US, I was asked where I was coming from and my picture was once again taken even after about 4 people had to see my passport.

Why is it that people think that anyone should be able to walk into the US across the Southern Border without any of these questions or requirements being asked of them.
Border and Customs Protocol?
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