Well, I guess I'd like to see the picture before I made a judgment on the situation. I dealt with the Secret Service occasionally in my 25 years as a federal investigator. I always found them to be reasonable and calm. If the school district called them, they were required to go and check the thing out. Maybe the school district overreacted, and maybe not.
I had to check out threats on occasion, too. Most were nothing to be concerned about, and usually very tedious to deal with - but you can't make that decision until you take a look.
I've been a liberal all my life, but I think I have to say that nowadays, terrorism is a real threat the whole world over. I suppose many of us will encounter situations where law enforcement officers stop by to check things out. In the vast majority of cases, they're just doing their job, checking things out to see if there's a problem or not. Most often, they find the work rather boring. We only need to be concerned when they abuse their authority.

-Joe Offer-