It should be pointed out that two of the three stories did have people who were clearly doing something illegal. The argument then becomes that if you are innocent, then you have nothing to hide.
Unfortunately, there are over 10,000 laws on the Federal books alone, so you're probably breaking the law without knowing it. Setting that argument aside, even if you are purely innocent, why allow the police to hassle you on their own suspicions?
So wherever you go this weekend, keep in mind that the police will be looking for an opportunity to bust criminals. It's their job and they like it fine. But don't make the mistake of assuming that they will help you out.
Naturally, this video applies all year round, but it never hurts to refresh yourself every now and then. Stay safe and don't call unnecessary attention to yourself from the police.