Is it because Titan was just so different from the ice moons that any Earth life would not survive?
In: Earth Science
The reason no probes have landed on ice moons isn’t because they’re concerned about contamination.
They don’t have atmospheres, we can see ice it is unlikely to be all that interesting up close. They don’t have the technology to build probes that can dig under the ice yet.
They went to Titan because it has an atmosphere and they wanted to see the surface.
Probes that are intended to land on a planet are decontaminated prior to launch, orbiters which aren’t supposed to are not because it is an extensive and expensive process
For the Cassini-Huygens mission, the Huygens lander was decontaminated to avoid bringing any microbes to Titan. The much larger Cassini orbiter was not because it wasn’t supposed to go anywhere that any microbes on board would matter.
Since Cassini was not decontaminated it meant that it had to be disposed of after its primary mission in a way that ensured that the microbes on it wouldn’t survive and contaminate something that we might want to check for life later.
There are international guidelines on preventing forward and back contamination of planets that NASA and other space agencies follow
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