I very occasionally travel through Witton station late at night and, in fact late at night on various lines. There are several factors that make stations late at night feel uneasy to me. 1) Unstaffed (I can't say I'd fancy staffing some of them though), 2) The platforms accessible only from one entrance and not visible from the surrounding area, 3) In an area with little "footfall" late at night, 4) few services stopping. Baglan near Neath is one I sometimes use that doesn't feel "good" late at night. Witton, being raised up from the surrounding ground level is a bit more exposed than some but, although residential areas are nearby, it is quiet late at night unless there's a match on at Villa Park.
You can wait at some stations sometimes and think, if a couple of dubious characters appeared, what could you do, where could you even try to go ? We don't know the full details of what happened but that is irrelevant in some ways as I think this sort of terrible incident and publicity will just encourage less use of public transport, especially late at night.
Do we want a railway system that is effectively a no-go area in certain areas after dark ? I don't think it has changed much to be fair and I don't have the answers but I do worry that, in an ongoing desire to get more to use train services, we may end up with many just thinking no thanks I'll drive.