Bruce Schneier quoting someone else:

...what if we chose to accept the fact that every few years, despite all reasonable precautions, some hundreds or thousands of us may die in the sort of ghastly terrorist attack that a democratic republic cannot 100-percent protect itself from without subverting the very principles that make it worth protecting?

Is this thought experiment monstrous? Would it be monstrous to refer to the 40,000-plus domestic highway deaths we accept each year because the mobility and autonomy of the car are evidently worth that high price? Is monstrousness why no serious public figure now will speak of the delusory trade-off of liberty for safety that Ben Franklin warned about more than 200 years ago? What exactly has changed between Franklin's time and ours? Why now can we not have a serious national conversation about sacrifice, the inevitability of sacrifice -- either of (a) some portion of safety or (b) some portion of the rights and protections that make the American idea so incalculably precious?

There are so many hard truths that need to be considered and understood. I think this is one of them.