I think at one point their weak ass excuse was target/training purposes. The elephant in the room is that you don't need hollow points for that.Maybe now is a good time to jog the memory?
DHS purchases 1.6 billion rounds of ammunition
" DHS claims that it is buying ammo in bulk to save money, but experts have pointed out that hollow point bullets cost nearly twice as much as full metal jacket rounds. They also explode on impact for maximum damage, which has caused some Americans to wonder what purpose they would serve the DHS domestically. Purchasing 1.6 billion rounds of ammo would also give DHS the means to fight the equivalent of a 24-year Iraq War. Members of Congress say the DHS has repeatedly refused to tell them the purpose of procuring such large amounts of ammo."
Why The Heck Is DHS Buying More Than A Billion Bullets Plus Thousands Of Guns And Mine-Resistant Armored Vehicles?
(^ is a Forbes article)