Actually they would still look. Why? Because there's no way to get any real idea of the possibility before we start looking.<quoted text>
Most scientist actually believe life can survive in places other than earth. Many believe there is other life in the universe and some believe there is other life within our solar system. Some think it may be microscopic organisms like bacteria. Some think there may be more than that.
So fact is they would not be looking for other life if they did not think it existed.
It's a very big universe out there...