Agreed. The guy had a lot of choices; he could have used a silhouette behind prison bars, or a stylized monopoly-man, or even peasants with pitchforks. But a shooting target is waaay too close to an explicit call for murder.
Given that they were made immediately after and in response to the shooting of the United Healthcare CEO, it requires some fairly lithe mental gymnastics to not interpret them as an effective call for murder.