Yeah, if we did this to ourselves, you are right that they’d need a shitload of ammo, bags, personnel carriers, etc.
The problem with that is that if our own government did that to our own people, I think they’d have a tough time finding enough people who’d think that it was not only the right thing to do, but necessary.
Cobalt bombs are called neutron bombs as well. The idea behind them is that they kill loads of people with neutron radiation immediately, but it leaves buildings standing.
The only people that would survive a neutron bomb attack would probably be file clerks, librarians, miners, prisoners in the inner blocks of a prison, people who work in the tunnels of large hydroelectric projects, etc.
They were designed to depopulate large cities and military bases. It still leaves flyover country, which actually works for invading armies. Farmers and ranchers either surrender and keep farming, or their families are kidnapped and tortured until they do.
How heavy do cobalt/neutron bombs have to be?
It wouldn’t look like we did it to ourselves, if North Korea actually dropped the bomb. It would look like our noble (foreign enemy combatant, to those who have comprehended the 2008 coup) Commander in Chief had done everything he could but an unhinged North Korean (or Iranian, take your pick) dictator had jumped the shark.
And Iran already sent a BUNCH of Hamas/Hezbollah operatives to Venezuela on direct unchecked flights. Between them and the drug cartels, there’s an army ready to invade - perhaps armed with WMD’s. A lot of them are probably already here in the major cities and awaiting the signal for some kind of WMD attack.
And the drones would be perfect for finding rebel patriots who had survived by being off the grid and/or escaping to the countryside.