i dont know which other 'incidents' you are referring to, but one thing is clear to me:
- philippino helpers are better organized and hence ensure better protection from exploitation
- indonesian helpers get scammed even before arrival in hong kong by their agencies, which are corrupt and in cohorts with the embassy here in hong kong. in addition, many indonesian helpers do not know about minimum wage laws, etc. and as a result are more likely to be paid less than the minimum wage
the above probably could explain why more indonesian helpers do 'weird' things, but frankly i have no idea on the background of the helper in this story