Yes all presumptions - as I didn't have tea and biscuits with the alleged CSK before his arrest!!!
Please note: I did say "IMO", so therefore I can guess CSK's motives according to what I think, and I never said they were based in fact.
FYI: I am a Perth local who's very familiar with Claremont area and Perth night life scene across many different areas.
Northbridge typically was a higher crime area (re: night time attacks on pedestrians type of crimes) and a very busy night spot with lots of police patrolling. Northbridge had gangs, drug users, people living off the street etc. Claremont was quieter suburban area with no gang violence, no street dwellers, and generally no real street crime. A few drunken fights here 'n' there but nothing too worrisome until January 1996.
Yes Claremont was/is easier to negotiate with many easy exits away from the area, and lots of places to hide - and I forgot to add these reasons to my list. thanks
Gosnells and Huntingdale were not on the same socio-economic scale as Claremont and its surrounding areas that were/are some of Perth's most expensive and 'elite' suburbs. Probably risking my life here saying this - but there's no comparison between the two areas!! Entirely different ends of the scale. So its not too much of a stretch to imagine a young man from Huntingdale/Gosnells area feeling envious or jealous about the 'wealth' in the Claremont area, and have this turn into a larger hatred for what ever reasons over the years. There could be many reasons. Could have been the footy reason. Or BRE could have been rejected once or numerous times from women who live in Claremont. Who knows! I'm just throwing ideas out to sleuthers!