Reporting (by showing) the cartoons does not equal “embracing” them, and the act of reporting is not necessarily “tacky and rude.” In fact, I believe not reporting it by showing them is simply an act of cowardice.
In a news story about the murders, the murderers made them relevant. I think the news is less complete without an example and in that case, it is not about being tacky and rude.
HOWEVER, the demand that all of them be reprinted as a way to somehow counter the murders is just a high pressure tactic to force people into supporting something they do not choose to support. That is different. TOTALLY different. It is as anti-free speech as the demand to not print them.