If there haven't been any tiger attacks in the whole time the net has been up then there's no basis to say that it has been a success or a failure.
Well, that's a relief. I thought you were going to point to the absence of attacks as some sort of proof that this system is working, despite the complete lack of any definitive evidence, like arrests.
You might even claim that the absence of attacks is a result of the nets being put up and therefore they have been a success.
Now, I ask you: How many terrorist attacks have there been on planes since this system was put in place?
Oh my...looks like I spoke too soon.
On a related note, if you're worried about tiger attacks, you can borrow my tiger repelling rock. It, like the snares, doesn't actually catch tigers, but it's guaranteed to keep them away. I myself haven't so much as seen a tiger since I began carrying it.
Note that I'm not saying it actually has been a success,
No, but you're certainly insinuating it rather loudly...
I'm saying I see no example of it having failed
As I made clear above, the complete lack of any terrorism related arrests clearly spell out the failure of this program. Either the terrorists are there, and are not being caught, or they aren't there at all, in which case the program is pointless...assuming, of course, that "capture of terrorists" was its actual goal...