Why did you choose to mock the name of the writer? That seems not so mature of you, or maybe you just made a mistake. 

Was that an assumption that all who are residing in the country without legal status are also burglars or murderers? Those were pretty closely linked in your comment. 

And, why would it be so bad if Mr. Suchman did comfort the child of someone who had committed a crime? Are you suggesting that the child of someone who commits crime does not deserve kindness and compassion in school? 

Finally, I'm not entirely sure how someone looks "Mexican as opposed to Peruvian or Costa Rican", as you've asked,  but since Mr. Suchman was quoting a student, who is Mexican American, it seems plausible that the student was asking about someone who looks like himself. And it's no secret that there has been plenty of animosity directed at people of Mexican descent lately.  Including your comment.