As we accumulate small additional likelihoods of Martian life, I wonder if humans will 1) put more resources into manned missions for intensive and flexible study to get to the bottom of these mysteries, or 2) defer plans for manned missions for reasons of environmental preservation/protection (or even fear) and stick to robotic or other light-touch/sterile explorations for a while. Just a passing thought.
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They do sterilize spacecraft before sending them to mars, that's a real thing. I believe we'd very carefully sterilize humans spacesuits and ships before sending them. I think the likely outcome of this is blind indifference to the importance of discovering life on another plan. No increase in Nasa budgets or plans for discovery.