This game is supposed to be a co-operative type of experience, so it's intended that there isn't much "soloing" possible. It is why you cannot perform surgery on yourself, even attaching your severed hand (even as an IPC). So no, you are not wrong to want people to not break into your department to "do it themselves". We are supposed to be able to co-operative and rely on others in this game to each play their respective role, but there are individuals who are incapable of that, or bitch and complain about the playstyle or experience of others.
Security and Heads of Staff aren't even good examples of loner jobs, as you need to be able to co-ordinate with other officers, or as a head, be able to manage your department. Closer jobs are Explorer (piss off into space) Miners (they could die on lavaland and be unnoticed) or a job like the Librarian/Journalist (the job is what you make of it) Close seconds are Virologist (making virus, yes, but mostly you are alone), Xenobio (yes they want yellow cores etc, but again often alone, or one other with you)
Ultimately, it is better to learn how to live in a co-operative environment, and how to deal with those who are overbearing, and try to one-crew everything.