Frickin lasers
I believe it's considered far easier to destroy a liquid fuel missile than a solid fuel missile. There was never any chance, nor any intention, of taking out the second test target entirely.
Secondly, while there's no denying that electrical lasers are the way of the future, it's worth noting that they're still nowhere near as powerful as their chemical brethren, and it's going to be a good few years before they catch up.
Having said all that, I'm certainly no expert on these matters, so feel free to correct me about any of the above.