Why do you need an AR-15
 

Because the government won't allow me to have an
M-4.

Because it is my right to own an AR15.

By Rights we should be able to all have M4's or any other full auto that we want because they'd be even better Militia weapons then the neutered semi-auto AR's that we have now.
Seems like the more the government takes the more they want.

Because I served in combat for my rite to owne one.

The same reason someone "needs" different clothes.

some are better suited for certain situations (weather)

It is our moral responsibility to prevent tyranny in government. Liberals do not believe in this individualism, so they demand complete totalitarian democracy upon patriots like me and you.

This explains why the most beloved American firearm in our generation is being trashed before our very eyes.

Sometimes squirrels run in packs? To show how reliable the AK-type rifle is? To remind people that DI isn't all that great? To impress the other mall ninjas? 'Cause you can't carry a real rifle? To justify all that CLP and cleaning kit crap?

;)

Because it is my right to own one whether I choose to do so or not.

It's my right.

Oh, and **** YOU, THAT'S WHY! :D

Because the Mexican drug cartel gets them for free from our government. I figure if it's good enough for them, it's good enough for me.