You may be wrong. Take a simple look at Mars. There are polar ice caps. The planet actually has seasons. That in itself is very revealing. Think of it. Our own world has polar ice caps, and this planet, Mars is in our immediate neighborhood, within the life sustaining distance from our own sun.
Microbes or microscopic organisms could easily exist in the ice or just under the ice, or just under the surface.
Its really not that hard to believe. Micro organisms could exist in the massive wind storms that sweep the surface, or under any rock as a means of protecting itself from those windstorms and elements. It seems stranger to me, the fact that no life, not even micro organisms, was ever detected on the planet Mars.