It sounds like these guys were on a SEED program or something similar. I did that for 4 summers or so. It’s a good way for a yeshiva guy to spend his summer, and–depending on the program–you usually end up learning a lot more than otherwise. (5-6 hours a day).
It sounds like your complaint is that there should not be summer SEED programs in miami, because it is hotter outside in miami than it is in Los angeles or in New Jersey.
I’m unconvinced. I don’t imagine the pritzus in miami in the summer is much different than in Denver or Phoenix or Baltimore, or Philadelphia or wherever.