What created the underlying discontent, more than anything, was Fernández's failure to tackle inflation - which tripled from an already-high 54% when he took office, to 160% by the time he left (as well as a birthday party stupidly held amid social gathering restrictions in 2020 - not unlike Newsom's 'French Laundry' scandal).
Massa, as economy minister during Fernández's last 18 months, was easily blamed by Milei and RW media for the failure (which I mainly attribute to the foreign debt crisis left over by Trump's pal Macri - as well as IMF interference).
Milei - who became a household word for his rowdy "anti-quarantine" protests in 2020 - quickly emerged as the "outsider" candidate (though, like Trump, actually a puppet of RW elites).
Now - his shock policy has succeeded in bring inflation down to a still-high 4% monthly (from 12% in November); but at the cost of a severe recession, with no recovery in sight (and his devaluation did push up the rate to 25.5% his first month).
So Argentines have a term for that: "the peace of cemeteries."
Sure, it's quieter - because everything's dead.