if specialized teams can find terrorits on the internet?

[kemperk]

why can't those same technicians who can fly and go
MOST anywhere, find hackers just as easily?

such as getting permission to enter the "back doors"
of big box retailers.......and finding out who else
is visiting.........

and why don't the boxes switch computer boxes
and take everything off the net at random times for
a few seconds?

and permit the systems to slow down every purchase
by 5 seconds; keep a customer's acct off syn till it
is swiped two times on a swiper--which brings their
acct on sync, etc.?

[Sera]

Hackers are communicating through proxy machines and operating through a string of different and innocent lines which makes it an impossibility to trace.

[Greywolf]

Knowing a machine's internet address tells you where it seems to be located, and tells you nothing about where in the world it is really truly located.

Oh, and terrorists do not use big box retailers, nor do they use credit cards that point to who they really are.

[DunbarPappy®ϟϟ]

Here's an article about finding the troublemakers:
Google highlights trouble in detecting web-based malware
https://www.computerworld.com/s/article/...geNumber=1
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They do get 'backdoors':
NSA pay to put a backdoor in RSA crypto; http://www.theregister.co.uk/2013/12/21/...0_million/
And Snowden revelations hint at major vendors who were approached by NSA (et al) to do clandestine spying...and compelled to not mention it by virtue or the Patriot Act Gone Wild.
Microsoft complicit with NSA; adding 'backdoors' to many services; http://www.theregister.co.uk/2013/07/11/..._for_feds/
(There are many hints of several vendors having been 'approached', so MS is not an isolated incident.)
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Forcing a global 'shutdown' (even temporary) of the 'Net is beyond practical.
Different governments have their own agenda's and all seek self-serving objectives, and they control their own 'backbone' servers.
Random, sporadic isolations would solve nothing: the architecture of TCP/iP assures that packets will eventually make their way to the destination, by moving thru alternate 'best effort' routes.
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Not sure what your last idea conveys.