That's not really the same. Most states have at-will employment, meaning you can be let go for any* reason or no reason. Elected members of Congress have more job protection than that.
When your buddy chose to use the fountain without asking - regardless of what else he bought, or if he was only getting water - he was in the wrong. The store owner could have called the cops and reported theft without taking a step outside.
*There are a limited number of federal protections even in at-will states; you can't fire someone for organizing a union, etc.
OK, so back to my original statement. Do you think an NFL player has more job protection than a common citizen in "at will" employment? If so, should Goodell be allowed to suspend them before their case is resolved?