I'll tell you why no charges were laid, because Air Asia (like most western governments and the Vatican these days) are too scared to upset the Chinese people or Government .... $$$ is $$$.
Asiana have lost most of their mainland passengers since they killed a few schoolgirls slamming into a seawall in perfect VMC. Malaysian have lost nearly all of their mainland china customers after a 777 goes off dumped into the sea somewhere.
Air Asia are trying desperately to get into the mainland market and don't want to upset their nouveau riche farmer passengers.
4 Chinese Tourists Reportedly Blacklisted After Hot Water Attack On Flight Attendant
Attacks on cabin crew happen in mainland every week and go unreported. Its normal here.
When I saw the bomber boyfriend guys passport page (shown on a chinese website) and he's from Anhui province i laughed, whenever I ask my FO where he's from and he says Anhui, its always in a quiet voice while looking at the the floor. Already ashamed..... it already has a reputation in China.
http://sinosphere.blogs.nytimes.com/...l-rebuke/?_r=1
You guys in Europe and US are in for a treat as these clowns get richer and travel further afield ....