(On the other hand, if reliable inlets of fresh water can be found, then the choice of locations where a probe should be sent just got considerably simplified....)
The problem with explaining the origin of life is, how did self-replicating molecules arise? DNA is very complex. Even the simplest life forms require some such complex molecules. But how could such complexity have arisen? There must have some intermediate forms, but we don't know what it was.
Once you get complex self-reproducing molecules, though, natural selection can do the rest in terms of making increasingly complex life forms.
Perhaps the intermediaries to get to DNA no longer exist. It would be like if we built sentient machines and then we died out. Later, the machines might wonder how they originated. The intermediate step, us, would be gone.
We need a probe that can scoop up samples and bring them back.
Oh look!
A Timeshare Salesman!
RUNNNNNNNN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
:-)
If Titan also has a sea made of tequila, then I volunteer to lead that mission.
Mmmm... intergalactic taffy...