I fail to see how anything you said applies to evolution in any way at all. What does water freezing or not have to do with disproving adaptation? Your suggestion that the freezing behaviour of water is somehow subject to concious control is patently ludicrous.
There are several reasons why lakes don't easily freeze solid, but none of them have anything to do with the nonsense you are spouting. If lakes are small enough, they will freeze. However, any lake of sufficient size almost never will except in extreme cases.
The reason most lakes don't freeze solid is because ice and snow are good insulators and poor conductors of heat. The surface of the lake that is exposed to the cold winter air will freeze into ice and this ice insulates the water below from further rapid freezing.
Also aiding the prevention of bodies of water from freezing solid is an interesting characteristic of water. Like most forms of matter, water become denser as it cools down, but beginning at about 4°C water begins to expand and lose density as it gets colder. It continues to expand as it cools and becomes the least dense when it freezes into ice. This is why ice floats.
As water under the ice becomes colder it rises to the top, freezing to the bottom layer of ice and thickening it. The insulation of the water increases as the ice thickens so cooling of the water under it slows. Ordinarily snow will also be found on top of the ice which acts as an excellant insulator. Also the depth of the lake often extends below the surrounding soils frost line allowing heat transfer to the lake water to occur.
Many lakes will eventually freeze solid if given enough time, a longer winter will also extend the depth of the soil frost line. Usually though the spring thaw arrives before that happens.
Next time please keep your non-sequitur "logic" to yourself or at least do some research first.
