Why can't alien races just take over Mars instead of trying to fight our military then failing hilariously?

@Fangirlsarah1996 don't forget underestimating cute or small creatures.

@Elegy Exactly...fukkin aliens don't know how to invade for shit.

Remember when they invaded LA?

They only brought air support and like...nothing else?

I remember when they attacked with poor AI. Difficulty was only measured in armor and life points... I mean that's just lazy programming.