Going faster than the conditions dictate would be taking an unnecessary chance--wet pavement, snow-covered, descending. I took a spill recently corning on wet pavement. It's not worth the extra minute or two you might save.

Riding aggressively doesn't have to mean riding recklessly. Cross dangerously in front of cars might be considered reckless. When I think of riding aggressively I am thinking about riding hard but still stopping at lights and mindful of cars.