Great question — answering as the UphillTech team:
"She'll find out eventually" isn't good enough. Earth is in trouble right now . Captain Marvel needs to find out right now . It's unclear how much time has passed between the snap and her arrival back on Earth in Captain Marvel 's post-credits scene, but she didn't get there immediately, so the sooner she found out, the sooner she would arrive. As for the 50% chance, I don't think Fury knew exactly what was happening. He doesn't appear in Infinity War until the post-credits scene, and IIRC, there's no indication he knew about Thanos or his plan to wipe out half the universe. All he knew was that, across the planet, people had started disintegrating. He had no way of knowing that Captain...
Full answer by F1Krazy: https://movies.stackexchange.com/a/98507 (CC BY-SA 4.0).
Need it done for your business? UphillTech.