Putin targeting critical journalists?

Without presenting any evidence, US media has been saying for years that any Russian journalists who die must have been poisoned by Putin. Of course, some may have been, as I don't exonerate Putin. But notice that those same Western journalists never bothered to protest when George W. Bush (otherwise known as the cute and affable painter these days) ordered that US fighter jets target the AlJazeera offices in Baghdad in 2003.  I guess for US media killing by poison is a terrible murder while killing with bombs is a mere war tactic.