Do you think these are Catholics acting badly?
The school no doubt is Catholic, but based upon Thailand's demographics and the school's own website (its a K-12 school, not a "college") there is no indication that the students involved were actually Catholics. The article clearly stated that the students organized this on their own and it was dealt with by the school.
So, you tell me where there is Church culpability and why this isn't yet another example of you posting anything that you think will reflect badly on the Church without actually fact checking or researching the article. A carefully chosen half truth is fully a lie.