I love how bad that list is.
Googling 'site:gov "justpaste.it"' also brings endless results of government documents mentioning the site in the context of terrorism.
I somewhat doubt US immigration authorities thwarted any would-be terrorists by asking for their justpaste.it username, but what do I know, perhaps this was an important breakthrough in the global war on terror.
It's pretty easy to think it's harmless if you live in a country where that viewpoint is not uncommon.
If you're putting terrorism related content on justpaste.it, you're probably pretty deep into the whole thing.