Bugs

Have you ever stopped and thought to yourself 'Why the Hell are spiders and mosquitos around'? Well I've thought about that many times and I never came to the conclusion of why exactly they are around. I mean Why were creatures that only bite and kill created? It all seems to come the conclusion of the food chain. Stuff the food chain get rid of these mutant beasts which have no place on this earth. I hate Wasps for one thing. All they do is fly around Stinging Continuosly without any need to. With the help of the Internet I got this short summary:
"God created spiders to get rid of mosquitoes and other nasty bugs. but i don't know why He created bugs in the first place..."
Obviously if you don't believe in God this is a load of bullcrap but either way it does not give me a whole lot of information about the topic. When someone is posting information on the internet they should not add in a 'I don't know' because it means that the reader does not gain alot of information. Anyhow from this I have gained that Spiders were created to kill mosquitos, but what the hell does that have to do with Wasps?.....