Now that I am a "TM-trained Homeland Security Analyst",(LOL) I was on the lookout for bomb laden vehicle deterrents and other security measures. We stayed at the Mandalay Bay and the only time ID was required was for check in and to enter the pool area. There were some very heavy concrete planters at the entrances to both the hotel lobby and the casino entrance, but it would not be difficult for a determined person to drive a car into either place. We were up and down the "strip" and saw no "overt" security measures anywhere. I'm sure they were there, but we didn't see them. (Europe is a different story. Lots of "overtness" goin' on there)
I know "Loose lips sink ships", but I'm certain that those with a wish to do harm will learn nothing new from my post.
I think of it more like loose lips will force those who are unprepared to get their act together. The bad guys have all the ideas already.