Even before I knew the backstory (thanks jfruh), I still thought it was about suicide. I pictured a guy imagining blowing his brains out, getting blood on the walls, and being so upset by this image he walks out of the house to clear his head. Instead, he sees the sky in the same color of red, "mocking" him. He can't get away from the thoughts, so he finally decides to end it all.
Even before I knew the backstory (thanks jfruh), I still thought it was about suicide. I pictured a guy imagining blowing his brains out, getting blood on the walls, and being so upset by this image he walks out of the house to clear his head. Instead, he sees the sky in the same color of red, "mocking" him. He can't get away from the thoughts, so he finally decides to end it all.