You make it sound like you’re mad these kids were born because now he is asking for tzedaka. Why didn’t you just generically mention that you know of such a person and ask if it is appropriate?
Because this is three different questions:
1: Should one bring such a child into the world?
2: Should one bring such a child into the world, knowing that he will need others to support him by doing so?
3: Is there a Chiyuv for the Rov who says to go ahead to collect money for when it is needed? IIRC, the Tzitz Eliezer used to say (for older women who were afraid to have children due to genetic defects) have the child, but come to me for a heter if there are genetic abnormalities. Isn’t that the chiyuv of the Rov? if so, why is this person collecting? He should be home taking care of his children, while his Rov should be out collecting.