[kragen]

"Disappear" (transitive) is absolutely a reference to a human-rights violation. See http://dictionary.reference.com/browse/disappear:

disappear (ˌdɪsəˈpɪə)

— vb

1. ( intr ) to cease to be visible; vanish

2. ( intr ) to go away or become lost, esp secretly or without explanation

3. ( intr ) to cease to exist, have effect, or be known; become extinct or lost: the pain has disappeared

4. ( tr ) (esp in South and Central America) to arrest secretly and presumably imprison or kill (a member of an opposing political group)

[ajross]

In the fourth of four variants, where all three of the earlier ones seem to apply well here. Language is language. Causes and issues, no matter how grave, don't get to own bits of it.

[chc]

None of the first three apply here. They are all clearly marked as intransitive ("The train disappeared into the night") rather than transitive ("Tumblr disappeared her").

[kragen]

The first three are intransitive senses; I'm sorry the abbreviation "intr" wasn't familiar to you, but it's quite common in dictionaries. Please delete your unnecessarily aggressive comment, ajross.