1) Is this finger pointed in your direction or upwards at the ceiling? 
2) Is this a plane flying in your direction or a missile launching vertically? 
3) Are these normal contrails or evidence of rockets launched upwards from the bridge? 
4) Is this a normal contrail or did Dr. Evil launch a missile from his lair in the mountain? 
5) Does this fence line come from beyond the horizon or does it start at the horizon? 
6) Does this contrail come from beyond the horizon? 
7) How about this one? 
8) Or this one from 2009? 
9) And finally....how about this, the supposed missile? 
10) Isn't it possible that it's a contrail just like the others, from a plane flying inland from over the horizon?
***Bonus question***
Here's the LAX webcam pic again that shows it from another angle: 
Are you really sure you're looking at a missile launch?
Would you like to call your lifeline?