A complete lie made up by the sandinistas. The sandinistas and the castro regime took chamorro out, to spark an uprising of the people, and coast into a revolution.
The only reason chamorro was anti-somoza, was because the chamorros wanted to take back the power they once had. For decades the chamorros were a prominent family, with a couple of presidents in their genealogy. The somozas displaced them, hence the hatred toward them by the chamorros.
Possibly but I think it was actually more Somoza's style. I will agree that the weapons used - shotguns instead of military rifles or pistols point to the FSLN but Tachito was not beneath being indirect.
Then again, Bert Ortega did everything but carve his initials in Enrique Bermudez's forehead.