I suppose my argument is then that war was already happening, and it was declared by Chavez/Maduron on most of LATAM and USA, the moment they decided to export their problems (drugs, criminals, destitutes), into LATAM and USA, hurting our citizens.
Anyway, that is the exact argument the Trump admin is making (drugs/gangs) but they didn't take it to Congress, as required.
It is certainly an act of war.
De Jure we do need congress' permission for war, as you stated. You are correct.
De facto, limited interventions (especially, special ops missons) have not had a need for congress for a while now.
Personally, I would say no.
However, a country persecuting its citizens doesn't bode well for the neighbor's citizens own security or well being, which is usually why it often leads to some form of govt vs govt war.
A government should not act with force until its own citizens are suffering, meaning, if brazilians themselves were hurt because of US policy.
I'm in agreement with everything you said, but none of it applies.
The US (or any other country) should never intervene due to a "bad person" or "illegitimate" or "dictator"
Instead, US intervened because the policies of Maduro directly led to the flight of 8M causing harms to many countries in LATAM, and US.
If a dictator was not actively enforcing policies that made foreign innocent (bystanders!) neighbors hurt or destitute, then your argument would apply
It was not a war bullet that have killed random Chileans, or Ecuadoreans or Americans. But nevertheless, there have been hundreds of venezuelan bullets (and drugs) kiling everyday civilians. The act of aggression exists (exporting hardened criminals and economic destitutes abroad) .
That was the casus belli. The US just happened to respond in force, when other countries couldn't.