I actually love how they made the High Evolutionary completely irredeemably evil. Too many villains are sympathetic in these movies, or have a valid point even though their methods are a problem. Every now and again you need someone that actually feels like a threat by the nature of their vileness.
What makes you think Ikaris is the villian? Arishem decided that the life of a being who can create dozens of worlds is worth more than the life of a single world and my bro is just trying to remain loyal to his creator