Straits Times deleted these sentences

The Straits Times Forum editor published my reply to Chua Sheng Yang but deleted the following sentences:

I can only recall the saying, “None are so blind as those who will not see the truth”.

Mr. Chua made a personal attack on my character in the last three paragraphs of his letter. I am surprised that your newspaper found it fit to print these unsubstantiated remarks, as they are not relevant to the main issue. I shall not respond to them.