So agree, but the logistical challenges for even landing a probe on somewhere like Europa or Enceladus are far greater than landing somewhere as inert as Mars. Jupiter has an incredible magnetic field, we'd need to somehow land on the moon (which is a challenge in itself due to the potential for 30m spires of ice), drill through the surface ice and possibly through multiple subsurface oceans til we reached a layer that had geothermal vents.
Also while I agree with you that it's very likely that there was microscopic life on Mars at some point in the past, considering that finding evidence of life on other planets would be one of, if not the largest discovery in human history, I think it's important to keep going until we confirm it.
Also while I agree with you that it's very likely that there was microscopic life on Mars at some point in the past, considering that finding evidence of life on other planets would be one of, if not the largest discovery in human history, I think it's important to keep going until we confirm it.