It’s sashimi, except a different meat. If one can eat sashimi one can assume some similar risks from beef (or bison). Stricter controls handling on the meats make it as safe as can be done.

I’ve had tartare and it was very good, but it was a one-time thing for me. As an American I have a hard time with the concept, frankly because our food safety system and how we raise animals for food isn’t all that great.