Ok, I'm not a complete nutjob here, and I understand two parts of why they bother, first the agency is there to protect our own planet from samples coming back: if the moon or Mars supported life for a few billion years it might become horribly invasive when brought back into the paradise that is our planet, so there is that. Second, they don't want a bacteria covered microscope looking for Martian bacteria because that would kinda nullify the results.
But anyway, I care. I personally feel that we have a responsibility to do whatever we can to take life off this planet ASAP. What if earth is rendered uninhabitable by some unforeseeable cosmic event? As far as we know life is unique to this planet and it would be kinda a bummer to see it all get wiped out when there was a chance to let it restart somewhere else. I'm morally opposed to protecting other planets from ourselves.
The whole article they talk about taking care of the solar system for future research, but fuck future research; if we successfully dropped life onto another planet, that would be way more interesting than our typical: "this rock has more iron than that rock," and I really see no need to save those rocks for our great grandchildren at the expense of creating alien life.