Americans who hold the musket-rights granting Second Amendment near and dear to their hearts — and love high-velocity rifles more than our children — should be watching the Parkland shooter’s sentencing trial. You, too, Marco Rubio. After all, of Florida’s two Republican senators, you’re the one who won’t budge an inch to enact any gun-safety measures. You, Rubio, and no-rules gun advocates don’t even need to be in this most tragic of American courtrooms, where the 2018 Valentine’s Day shooting at Marjory Stoneman Douglas High School — the deadliest school shooting in Florida’s history — is be…
