It sucks that lions have to kill other animals. If I had the ability to convince them of that and provide them with an alternative besides death I would. You are not a lion though so I can try to convince you, and lions do a lot of other things you would not choose to emulate.
It's also a false equivalency. What lions do is nothing compared to the enslavement and torture that happens at an unfathomable scale in animal ag. The brutality of nature is overstated in most human narratives.