MSNBC host Lawrence O’Donnell made the claim that a handgun fires a bullet a third as slow than an AR-15 rifle, making a handgun less safe to use for teachers.
O’Donnell’s reasoning was that the difference in bullet speed from a specific type of firearm means that one is less effective than the other and that teachers should not be armed with handguns because handguns shoot slower than an AR-15.
Here’s what O’Donnell said and what MSNBC posted  on social media:
Lawrence: A bullet fired from an AR-15 travels 3x faster than one from a handgun.
And yet the president and the NRA think giving teachers guns will stop a school shooter https://t.co/heze69kRDU 
— MSNBC (@MSNBC) February 23, 2018 
While O’Donnell is correct on the difference in bullet speed between a handgun and an AR-15, his argument is incoherent. Just because bullet speeds differ does not mean that teachers should not be armed to defend themselves and their students; a handgun can still be relied on for self-defense.
MSNBC and O’Donnell failed to mention how two police officers used handguns to defend Republican politicians from rifle fire last summer, where Republican Rep. Steve Scalise (La.) was seriously injured.