Why are insects so evil in games?

Okay, I'll start out by saying I'm sorry if this has been brought up before in these forums. I'm pretty new to this site.  
 
So anyways, I just started playing Mass Effect 2 (I know I'm late to the party) but what I noticed as soon as the story started to unfold was that the enemy was essentially insect like creatures. Now I'm no bug lover myself, but I immediately started to wonder why insects are so prevalent as enemies in video games.  
 
The other big example of this is Starcraft. Zerg are very insect like in the way they act, to how their portrayed in the story and the units themselves.  
 
So, what are your opinions on the buggy villains populating space and many other places in video games?

People are naturally afraid of bugs for a variety of reasons, ranging from the fact that they look about as alien from us as any living creature to the fact that it sucks when you find them in your food, and it gives designers a bunch of different but inherently related ideas to grab from.  Personally, I'm fine with killing more bugs in games.

And bats, no game is complete without enemy bats

 While using a bug-like creature as the antagonist you can easily create a pretty scary monster that feels as alien as ever, and the only thing that is recognisable about him is the overall disgust and fear towards bugs.

Well social insects such as ants live and die by the hive, right? Without any sense of individuality. 
 
They're basically alien-looking communists.

REALISM!  Have you played Earth Defense Force 2017?  Ants will be the death of us all!

Insects are sort of digusting to most ppl and you have no hesitation to squash them unless you are afraid of them.

Because fictional living creatures can't get much more scary and dangerous-looking than oversized bugs.

Cause bugs are ewww, and ewww things are evil.

It plays on our dislikes. Most people dislike insects or arachnids in at least some way and when we see them as the enemy in games we are likely to hold an inherent dislike towards them and feel more satisfied when we kill them.

Insects have had it coming for a while tbh.  Spiders even more so.

Because they are "EVIL".

They are fine in Zelda: OoT, quite helpful actually.

 Have you ever heard of insect politics? Insects... don't have politics. They're very... brutal. No compassion, no compromise.

Man, they're evil in real life.
 
What has an insect ever done for you?

 http://io9.com/5723024/the-evolutionary-basis-for-morality-might-be-completely-disgusting
 
It's natural to dislike them.  I do love ants, though.  Wouldn't shag one, but do love them.

This thread makes me want to play SimAnt -- A game that really respects its insects. 
 
SimAnt also had a really thick manual with all kinds of ant trivia. Playing it as a kid gave me a life (so far) long interest.

Cephalopods also get a bum rap. Specifically octopuses, but squid also fair poorly.
 
Seems anything with more than four legs/tentacles is up to something in the eyes of game designers.
 
It'll be cuttlefish next, mark my words.

Clearly we need a Kamen Rider/Mushiking-esque game