1. A 2-3x raw increase in homicides is a huge number, particularly when compared to places with hundreds of homicides per year already.
2. Nobody has ever been killed going to a Detroit Lions game.
3. While I agree with you that the majority of killings are targeted, Mexican levels of violence are still extreme, and the chance of getting caught in a cartel related violent episode are much higher than the chances of being killed under similar conditions in the US. It happens multiple times per year, to US citizens, in Juarez specifically.
4. Juarez has nothing of note to offer the average American. If you want to visit Mexico, there are other, safer places to go. It's an unnecessary risk for reckless people who want to feel like cowboys for a few hours.
I wouldn't go to Juarez because there's nothing to see. But even though the murder rate is 2-3 times higher than the most dangerous US cities, the chance of being murdered there in the few hours you are there are very close to 0, roughly the same as visiting some touristy area in Detroit or St. Louis.