MEXICO CITY (AP) — Salvadoran troops bombard a gangster’s home from helicopters over the Haitian countryside. Civilians cheer on marching camouflage-clad soldiers. Armored cars drive through the Caribbean nation’s gang-ravaged streets. The videos flood the social media of Salvadoran President Nayib Bukele, Salvadoran officials and an army of pro-government influencers with a simple message in...