Are We Less Safe Now Than We Were A Decade Ago?

After the Boston Marathon Bombings, Americans across the country are a bit shaken up and questions regarding marathon security are arising.  Every major event since the bombings have had extra security.

But is there an actual security threat?  Or is this just a perceived fear of another event like the Boston Marathon Bombings?  Like any event, there are extra threats that arise from copycats across the country.

Even now, there was ricin-laced letter intended for a Mississippi congressman.

While most of these post-bombing incidents are designed to just harp on the jittery American public, we must ask, are we safer now than we were one decade ago?