At those speeds you can stand 100m from te stage and still be in danger.
But there are indeed a lot of very stupid people in this world, looking at some videos.
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Video WRC Ypres Rally 2021
https://www.youtube.com/watch?v=V0aTBPzEnTk&t=1s
Flaaatttt ouuuuttt https://youtu.be/Nh8JEP0xZwU
On tarmac you have full grip and when you lose the control you have zero grip. The car often even starts flying in the air, which means the speed is reduced less compared to sliding on gravel. This is apparent even from tarmac crashes with small FWD cars, let alone WRC monsters. Meanwhile on gravel you are usually already rotating/sliding the car when entering a corner, so it results in a roll which drains the movement energy and the car cannot change direction so quickly. Especially these fast tarmac rallies with bumpy surface are scary, both for the drivers and spectators. It's not so scary when the roads are slower (Corsica) or smoother (Catalunya).
For me the current WRC cars changed the character of the Ypres Rally somewhat. They seemed too fast with the extra power and aero compared to previous cars I've ever watched on the event. They looked just brutal and like they were bludgeoning the roads into submission.