I'm fairly sure the WH staff checks their security on a fairly regular basis, like the rest of the government, they have exercises to test their reactions to certain issues.

The Secret service were highly likely following their SOP to the T, if they weren't then shame on them, but I don't think heads should roll as they still went through security, and as such were unarmed and a threat to no one.

As far as the couple go? Ignore them, it would be the ultimate punishment for them. Sadly, though, they have their 30 days of fame.