Crop marks, commonly used in printing

instapundit.com
TIM BLAIR: “Funny thing about those crosshairs. They ain’t crosshairs. These are crosshairs. The …: TIM BLAIR: ...
Jumping to conclusions.

As opposed to what is actually known. And taking precautions to protect the public. There are those apparently public death threats:
memeorandum Firehose
Jared Loughner is a product of Sheriff Dupnik's office (The Cholla Jumps)
WaPo:

Arizona has what is considered one of the most progressive mental health laws in the country. Any person, including any of the students in Loughner's classes who exchanged worried emails about his strange actions or any of his teachers who sought to have him removed or who wanted him to receive treatment, could have petitioned the court to have him evaluated for mental illness.

Unlike other states, which require that someone be an imminent danger to themselves or others before seeking to have them involuntarily committed for psychiatric evaluation and treatment, in Arizona, one need only be "persistently or acutely" ill.

Persistently ill. This kid was an adult, but he could have been helped.

That would have taken common sense.

...More. Michelle Malkin chronicles what conservatives have endured. Ad hominem attacks are the left's primary tool--they don't want to debate they want us to just shut up.

The Tuscon massacre ghouls who are now trying to criminalize conservatism have forced our hand.

They need to be reminded. You need to be reminded.
Confront them. Don’t be cowed into silence.

And don’t let the media whitewash the sins of the hypocritical Left in their naked attempt to suppress the law-abiding, constitutionally-protected, peaceful, vigorous political speech of the Right.

They want to play tu quo que in the middle of a national tragedy? They asked for it. They got it.
HT Pundit & Pundette

...Anything to say, Sen. Durbin? Anything?
What are we to make of Obama’s warning of “hand-to-hand combat” if the Republicans take over; or his comment that one of his supporters could “tear [Sean Hannity] up”; or his Untouchables boast that “if they bring a knife to the fight, we bring a gun”; or his advice to supporters of his presidential campaign to argue with Republicans and independents and “get in their face”?

Why would a president boast about figuring out “whose ass to kick,” or, in a climate of fear about terrorism, call his opponents “hostage takers”? In a post-9/11 world, is it prudent for the commander-in-chief to say of his political opponents, “Here’s the problem: It’s almost like they’ve got — they’ve got a bomb strapped to them and they’ve got their hand on the trigger. You don’t want them to blow up”? What about, “But you’ve got to kind of talk them, ease that finger off the trigger”?

But those crop marks are a clear and present danger.

More. I should have put this link in earlier: Arizona Star quoting Sheriff on previous death threats.