I am soooooo glad that we actually have a Bill of Rights. Few of us think the concept of presumed innocent until proven guilty is silly. God bless the USA...pretty exceptional.
It's part of our system down here too. You have to prove a charge beyond a reasonable doubt.
As for the fifth...let's see, a guy gets asked a question in front of a Grand Jury and takes the fifth. I've gone from not knowing whether the guy is in some way guilty, to definitely thinking they are guilty of at least something, why take the fifth otherwise.
The irony being, I'm sure it was put in to make ineligible statements made under duress...when taking into consideration this thread...