magnetism shielding us is why there is life - this is why there is no life on the smaller planets of mars and venus

it's complete nonsense that they used to have life, without protection from radiation DNA is destroyed and at best there might be bacteria in the soil far down below the surface where it's wet and stuff

but it's true, without cells aggregating carbon into fibres there would not be fire very often

once in a thousand years an oil spring would catch fire from a freak lightning strike on a very hot day 

 based and abiogenic oil pilled 

 There is ten tonnes per square metre of matter shielding between each square metre of Earth's surface and the Karman Line. That is orders of magnitude more shielding against cosmic rays than even fragile complex slow-breeding critters like us require.

Magnetospheric shielding is only directly important if you're in orbit.

(It protects out upper atmosphere from erosion of light fractions by the solar wind, which is very important but a separate problem).