It's not the St. Louis Cardinals that did this. Somebody came up to the mascot had gave him/her the sign to hold while taking pictures as Fredbird does during games. They said Fredbird didn't know what the sign read before he/she held it to take the pic. Even if he didn't, they always have a couple of blonde cacs with Fredbird at all times when walking around the park so at least they saw the sign. It wasn't at a police function. The police union or whomever got the picture and posted it on their FB page. The Cardinals got wind and told them to take it down. Either way, it's very sloppy to say the St. Louis Cardinals were mocking the black lives matter slogan.