Blowback keeps happening. IIRC, the modern Central American drug gangs were born of US funding and training of anti-Communist forces in the 1980s.
Remember it next time someone says, 'let's send arms to those insurgents!' Obama dialed it back, partly for that reason (AFAIK). Biden apparently has embraced a policy of 'restraint', with the idea that outcomes from US intervention often are counter-productive.
(I don't support it - instead, accept the challenge and find better interventions. Quitting is a bizarre solution IMHO. People still need freedom, and need help.)