They march in the street because the attack was on them. You didn't see the same outrage when the attack was on the U.K. or for that matter on the U.S.
What's surprising about that? Whatever brings it home to them.
PS: Sometimes the ends do justify the means.
If you're talking about stamping out human freedom to create a theoretical utopia, then no, the ends don't justify the means.
But if this guy I have here in front of me knows where a suitcase nuke is ticking away somewhere in lower manhattan, and has already admitted that he knows, then sorry Charlie, the ends justify any damn means I can devise, as long as they work.
And I know one of the leftist methodologies is to claim "torture never works, you can get anybody to say anything under torture", but of course that's an obfuscation and a lie when you're talking about specific verifiable pieces of information.
Torture works. If the circumstances are right and you've got the right people locked up.
To risk millions of American lives to protect the theoretical rights of some lousy murdering scumbag terrorists... now there's a clear case of the ends not justifying the means.
The end (being able to say "we are pure, we are PC") does not justify the means (sacrificing millions of American lives).