Of course it's about the Monroe Doctrine! This time its careless and on steroids!

"Afro-Venezuelans have nothing to lose from this Trump's attack."
OH YES THEY DO! Just as Afro-Panamaians suffered the most during the attack on Panama(Noriega time), Black Venezuelans will suffer disproportionately.
A disproportionate number of Black Venezuelans supported the Chavez revolution/Chavistas and continue to support Maduro, so if & when Trump attacks Venezuela, the reactionary Blancos will target Afro-Venezuelans for revenge.