The Open Door Policy in Lincoln's White House.

[LincolnMan]

And yet in that era of “openness” Lincoln was murdered. No president before him had been killed in office- though an attempt was made on Jackson. Maybe in the minds of people back then it was considered unthinkable even so. Potentially, if Booth wanted to easily kill Lincoln he might have done it using the open door policy. But then he would not have escaped. Lincoln did receive many death threats. I suppose he thought that if any of them were to be carried out they would have not been done by murdering him outright in his office. I’m sure he didn’t imagine being killed in a theater either.