They were very foolish not to purge the military after the last time. At the very least they should have set up armed people's militias or something to counter and check them if even a little if it wasn't possible to purge the military.

Fact is the US is going to continue trying to coup Bolivia forever, well as long as lithium has value to their plans which is going to be some time. That and the fact they buck the US to do things like try to join BRICS+ and yeah this is incredibly obvious and they really should have done more to secure ideological loyalty of the mid-level officers and troops.

And sooner or later and this may be the time already, it may already be too late, they're not going to care about keeping the mask on, they'll just straight up tell their puppets to massacre anyone giving them serious resistance and then go around jailing, torturing, killing those from the old government as is the usual modus operandi.