I don't think any technology in and of itself provides security. It's the way in which it's used.
In the case of biometrics, I have studied the use of it in border security for about a decade now. There simply is not sufficient data to demonstrate that when in fact it is used it provides increased security. One of the problems is there is not a clear “problem” that it is being introduced to deal with. For example, with the U.S. visit system, there is no clear evidence that the United States is necessarily more secure. It simply is not there. The flow of migration, particularly at its southern border, continues with the use of AVATAR. Those things continue. Yes, you can create more profiling, but the extent to which that is in fact useful is not clear. There is no evidence.