Why not just block the areas who are known to harbor terrorists right to access the internet. Why must everyone pay for a few bad apples mistakes.

There are some who would argue that pretty much all the organizations committing acts of terrorism today are exactly the same organizations who are claiming that no one except them ought to have access to strong cryptography or else terrorists will use it.

You can't be serious.  Banks already co-opted the state, and in the words of Max Keiser:  "Lloyd Blankfein is a financial terrorist".  It doesn't matter if the criminal organization is debilitating your existence through nail bombs or financial fraud and usury, the state (current one at least) already is a terrorist organization.

Leaving aside futile preemptive attempts to deny terrorists access to secure communications, I have no more problem with cracking a terrorist's vulnerable computer system than I have with cracking a terrorist's vulnerable skull.  Provided of course that by "terrorist" we mean a person who is actively initiating violence against others in order to manipulate the innocent through fear.  Such attacks invite defensive force against the attacker through whichever vectors are available to most efficiently minimize harm to the innocent.