Why would Luigi Mangione plead guilty if he still risks life in prison?

Misspelling for last name, I get it. But what I don’t get is the purpose of the plea. The feds are still going to want life for him. Nothing to be gained at all. And there’s talk about getting the state charges thrown for double jeopardy. Again, he wouldn’t be facing capital punishment on those.

What’s the whole point then?

Why would Luigi Mangione plead guilty if he still risks life in prison?
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