FBI received over 10 terabytes of visual evidence. I can't imagine there wouldn be any privacy in a huge event like the marathon. Additionally, he placed a bag in front of Lord & Taylors - the same store that charged his mother with shoplifting. Of all places, wouldn't you think they would have surveillance?There is simply no way they expected to be caught on camera and/or captured.Didn't see this posted earlier - looks like suspect #2 was working out on the UMass campus and went to a party with friends on Wednesday night. Not exactly the activities of someone who just set off some bombs two days earlier.
http://www.dailymail.co.uk/news/article-2311580/Boston-bombing-suspects-brothers-Dzhokhar-A-Tsarnaev-Tamerlan-Tzarnaev-links-Chechnya.html
They were going on with life as usual until their pics were blasted all over the world.