Well in a way all those women are pretty stupid as well letting Deb undermine MC. They know he is ex special ops and Deb is not even if she is militairy. Secondly Mary did everything she could for years to keep MC away from Milly for whatever reason and still now she calls for him to protect Milly and did not ask Deb, while she knows Deb will not have all the trust issues and other things with Milly.
Now with all those women knowing that, they should at least be aware that Mary,knowing them both, considered MC to be the way more qualified one, since despite all the problems he would face with Milly and her reasons for keeping him away, she still considered him the better option.