If they have specific gang tattoos across their faces or bodies, i .e. known affiliates of violent gangs, do you want them to be free and participating in normal daily life?
If the tattoos didn’t indicate gang membership, the gang themselves would detain and dismember impersonators.
The cities in El Salvador were not suitable for tourists before Bukele, and now they are… Are there better ways to achieve this? I’m sure there are, but not as expedient considering the scale of their problems pre-Bukele.