Also, these Mexican cartel won't be messing with any foreigners that will be around in their country during these games because surely, the respective nations will hunt them down and destroy each one of them until their whole business will turn into ash and I bet they don't want those things to happen. Besides, it's also their pride that their country will be hosting some of the World Cup games and they know that these things are rare.
Yes, it is indeed unrealistic believing that the Mexican government can handle the situation well and prevent such things from occurring in the said event because they can't even handle the chaotic cartels inside their jurisdiction, what more about these said events? Well, I'm also one of the hundreds of thousands of people that is hoping that there won't be any chaos during these games.
If the issues are just an internal problem that are occurring almost every day, then indeed, the Mexico has every right to handle and solve the situation. But these things will change if there's an unfortunate event that a foreigner will be involved in such disaster, the countries will do everything on their power to intervene and to help solve the case as soon as possible. Truth is, this is not new anymore because there's a lot of documentaries about these stuffs.