Because only Sony has made their concerns public. Everybody else is putting their concerns forward in private. That is generally how these things play out.
The UK CMA suggestion to Microsoft was broadly that the UK would approve the deal if Call of Duty was spun out of the deal. Microsoft have yet to accept that, which does call into question their position on Call of Duty not being very important. If it's not important, and the only think standing in the way of UK approval, why wouldn't Microsoft leap at this?
For what it's worth, I also don't get the Call of Duty hysteria either. I'm clearly not the target market, which may be angry, racist homophobic teens.