Why relocate turtle nests

From an article by Bob Klotz in the Sac Be newsletter:

When walking on the beach at night, visitors frequently come upon sea turtle protection technicians—called “tortugueros” in Spanish—observing nesting turtles, counting eggs, taking measurements, affixing numbered identification tags, marking nest positions, monitoring hatchlings, and under certain circumstances, relocating eggs from one place on the beach to another. Tortugueros are trained in this work, and must carry official identification cards and copies of the federally issued permits which authorize them to work with sea turtles, which are endangered and protected under federal law.

One frequently asked question is why a nest should be moved.
Under ideal conditions, they should not be moved. Sadly, the presence of tourists or local visitors on the beach frequently leads to less than ideal conditions. In addition, preservation efforts are occasionally at odds with “natural” practices.

With respect to managing new marine turtle nests, standard practices recognized by the Mexican federal government offer four options to authorized tortugueros. In order of preference, these are:
(1) leaving the nests where they are;
(2) moving the eggs to an ostensibly safer position near the nesting site;
(3) moving the eggs to a protected area, called a “corral;” or
(4) moving the eggs to an artificial incubation facility.
Leaving the nests where they are is generally the optimal situation, since natural nests have a higher level of hatching success. When left in place, however, they do face some natural threats.