Here's what we know:
* Sea turtles are not a primary prey item for orcas: Orcas typically focus on fish, marine mammals (seals, dolphins, whales), and other marine animals.
* Attacks are rare: There are only a few documented cases of orcas attacking sea turtles, and even then, it's unclear if they were actively seeking them out or simply taking advantage of an opportunity.
* Orcas have the ability to kill sea turtles: They are powerful predators with sharp teeth, making them capable of killing even large sea turtles. However, the hard shell of sea turtles makes them a challenging prey item.
In conclusion, while orcas can eat sea turtles, they don't typically do so. It's not a common food source for them, and the attacks are rare.