The same reason that anyone does any risky activity... Adrenaline and dopamine boosts. Riding motorcycles are a calculated risk, one that can make you feel absolutely amazing. You can greatly reduce the risk by riding safely and defensibly. Give yourself space, assume everyone is out to murder you, avoid riding at night, absolutely do not ride inebriated, wear visible gear, etc.

Here is a short from a doctor who rides, explaining his rationale https://youtube.com/shorts/r53eHYCF6Sc

And a video breaking down accident stats https://youtu.be/uZm8Kj0fC88