Why didn't Noah swat those two mosquitoes
?
I hate to be the bearer of bad news, but he wouldn't have had to swat two; it would have been roughly 7,000 (because there are about 3,500 species of mosquito).

At any rate, annoying (and sometimes deadly) as they are, it's good that he didn't, because mosquitoes and their larvae are major food sources for other animals. They also pollinate plants (nectar is their real diet; females just need the protein from blood in order to lay eggs).
What about those cockroaches?
There's about 3,500 species of them, too.

The good news is, the majority of them aren't pests, but inoffensive detritivores that aid in decomposition.
Okay…something we can all agree on: the Gulf oil spill is a tragic and infuriating disaster.
