I assume the posters are either antifa terrorists, or are so aligned with their ideologies that there is really no separating them.

Watching the video you would have seen a mob screaming for the death of Kyle running at him, and chasing him. Many of which were swinging with weapons, or had firearms.

'he wanted to murder someone' does not align with the video of Kyle. On the contrary, Its certainly true of his antifa attackers who were howling for his blood.