Are you under the impression that the evidence would point to murder but the government wouldn't investigate that? Obviously it will be investigated. The "people at the top" would be prosecuted if there was evidence they were involved, and not prosecuted if there is no evidence. That is what we want from the government.
You can't read one headline, assume you know exactly who did exactly what illegal thing, and then immediately declare conspiracy because the evidence doesn't currently prove your made up claims.