If you add "junk" to reduce the 75 % to 3 % you've made the target for a cosmic ray about 100 times bigger.
That's true, but some agents don't act like cosmic rays. If you have an infectious agent that is going to attach to something, maybe having some 'blubber' does provide protection.
Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
I would say here something that was heard from an ecclesiastic of the most eminent degree; ‘That the intention of the Holy Ghost is to teach us how one goes to heaven, not how the heaven goes.’ Galileo Galilei 1615.
If there is no struggle, there is no progress. Those who profess to favor freedom, and deprecate agitation, are men who want crops without plowing up the ground, they want rain without thunder and lightning. Frederick Douglass