Why would a man from China on his holiday deliberately pour hot coffee over a baby in Australia?

https://www.dailymail.co.uk/news/article-13955851/Chilling-new-theory-emerges-Chinese-man-poured-hot-coffee-baby-Australia.html

Very disturbing. Apparently authorities refused to release any details of the case and the press withheld the man's identity from the public and the man was able to fly home to China without having justice done upon him. Some say this is common in China where they take revenge on soceity. More such attacks are said to be expected.

Why would a man from China on his holiday deliberately pour hot coffee over a baby in Australia?
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