Presidential threats are bad, nothing else matters?

There was recently a facebook poll asking who thinks Obama should be killed. The potential answers were "yes", "maybe", "if he cuts my healthcare", and "no".

The poll was found by the secret service and of course taken down.

I don't really mind, it is the job of the secret service to protect the president so they probably look around for stuff like that all day. Also, that poll violates the facebook term of service saying "You will not post content that is hateful, threatening, pornographic, or that contains nudity or graphic or gratuitous violence". This person of course posted threatening content.

However, there still remains a page titled "I want to kill myself" which appears to be a place where people write that they want to kill themselves and post "suicidal pictures". This page has been up for a while, it seems.

It simply intrigues me that when a person talks about killing the president it is removed in a matter of days, hours even. But if a person is talking about killing themselves it is completely overlooked.