Stipe:
It's a flaw in this whole thread that the "event" was total destruction. I'm surprised we haven't moved on from the mistaken thesis. But since we haven't I can offer plenty of common sense to your challenge. Warning to creationists: I'm about to theorize using common sense and logical thought based on commonly understood principles of ecology and biology.
Because Dinosaurs were very large and high-consuming animals. From a biological perspective they embodied the phrase "The bigger they are the harder they fall." Many large scale events like asteriods and volcanos don't work like nuclear bombs. They don't immediately incinerate all life on the planet. Instead they destory a small area around impact or eruption. Then the fallout occurs over months and even years. The debris that can enter the atmosphere can literally blot out the sun around the globe even though it is isolated at impact. It can cause drastic climate change and shifting weather patterns. This can lead to drought and changes in the food chain. These events don't kill everything and may not even kill most things. It just makes things suck really badly for a really long time.
The dinosaurs would probably have been the hardest hit by even slight disruptions in the status quo. Being at the top of the food chain is not always a good thing. They probably required hundreds of pounds of food daily. A major event that distrupted this would have led to starvation or cannibalism or simply death from being unable to adapt quickly to environmental changes (they were cold-blooded) etc. Imagine living in paradise and having it taken away overnight. I think you Christians have a story like that
Small mammals, fish (and yes microbes) could survive adapt. The misperception is that an asteriod would be like a giant bomb that destories the whole earth. Sorry but no.
And to your remark that evolutionists are somehow shady because we have more than one possible explanation for extinction of dinosaurs is so silly. It's the creationists that keep claim it can only be god and nothing else but offer no support to make the argument stronger. At least the multiple scientific theories have support in the world around us that we can use as a basis for building them. By having more that one non-god possibility we simply show that it's not difficult to explain god out of the picture. Not being certain of which one doesn't weaken the case that god isn't needed to make the picture consistent.