I can see what you are saying. However, a US Marshall does not live with the family nor do they have daily contact. The contact they have is stuff that the family or marshall needs to know from each other pertaining to the situation. They are given new names, ss numbers entire new everything as if they died or fell off the earth. Then moved to any number of small or large but usually smaller cities where they are known by their new names and never discuss their old selves This protection makes it doubtful someone knows them and will call them out by their real name. Even the Marshall isn't allowed to reveal to anyone family included who they work for but the government or any of the cases ever to protect them. They are free as anyone else to walk down the street without a swat team watching as it is assumed they are not compromised. Nothing set a sense that they were compromised until way past until it was too late for anyone to help he was hours ahead of them.
The Marshall does have a gun but he didn't necessarily have it on his side 24/7 especially when at home (if watch when he comes in he throws the jacket and holster on a stand ) as it showed him to be. No doubt it was there nearby but he was blitz attacked so no way to get to it. Marshall and Hotch talking were through the phone of the agent so he had no way to contact but in this context he could. Jack "working the case" you never had little kids their ideas and imitations can be anything such as hiding in a box next to daddy working. Was Aaron to tell him he hunts horrible serial killers all day and kills bad people ? I do agree if I were Haley I may at first be taken over by emotion on hearing he died but when my senses returned I would think the agent would never for any reason use my real name and any replacement one would come to me not me to them and hide deeply sending a message to someone secret as can. All over except the setting of a investigative meeting to see if Hotch was to blame the show was one of their best. I do realize in the real world an officer of any type would have to answer to beating someone to death not just walk off free of actions.
The last thing you mentioned though is why Haley didn't know what the reaper looked like. They are rarely shown what they look like to avoid panic and if they are that close you usually dead anyway. Hotch also never brought work home so she never seen a photo of him or anyone else they worked on cases .
Last you mentioned Mandy being written out need to do some research he hated the showed and the violence it projected and never showed up for a table reading the beginning of the next season, then wrote to his co-workers and told them it bothered his conscience too much for dead people, murder, rape and so forth and wanted off the show. It was nothing to do with producers, directors, other actors or stage stuff. It was a personal choice. I loved Gideon he was good but I have to wonder why his agent didn't ask what all his character would entail so he knew It was not a job for him before took.





