The issue here is why there was no search warrent issued for the residence, if there were prior arrests made there? The police made a reasonable effort immediately to find the child, and did not have the information at the time that the residence was vacant. Time was of the essence, and they went to search other residences and areas.
And, if you read the article at all, you would have read that the writer of the article was espousing trampling the 4th amendment because it's "for the children." This is a horrible reason for breaking the laws that are on the books.