Tonight on the Last Word: A report details “egregiously poor” decisions by police during the Uvalde school shooting. Also, Steve Bannon’s contempt of Congress trial begins despite his multiple attempts to delay it. Plus, gas drops to a national average of $4.52 a gallon. And Vladimir Putin heads to Iran as his army attacks Ukrainians. Tony Plohetski, Edgar Sandoval, Texas State Sen. Roland Gutierrez, Glenn Kirschner, Jill Wine-Banks, Amos Hochstein and Peter Beinart join Lawrence O’Donnell.