Basically they're what made MRAPs obsolete. They cost very little. They're easy to make. They don't need military grade explosives (although RDX and HMX work best) dynamite works - just make them a bit larger. They're extremely effective against armored targets even at 50 - 100 meters standoff. They're very hard to detect and very difficult to neutralize.
If the government continues to use it's standing army (the thugs in blue) to treat the citizens like subjects of a communist tyranny, then sooner or later those who are being subjected to tyranny wil rebel with someting more condign than complaints on places like FR. And then it will get really messy because the government isn't going to roll over and give back the rights it has been vigorously stealing for the last hundred years.
“the government isn’t going to roll over and give back the rights it has been vigorously stealing for the last hundred years.”
...and on that very subject one would assume that States having been usurped, would be completely on board with retaining what they have and reacquiring what they have lost. In most cases you would be wrong. The States unfortunately have grown accustomed to being wards of the Federal Government at the expense of individual freedom and liberty.