I almost agree with this, were it not equivocating two different senses of the phrase “possible reason”.
There's no legitimate reason for people to support these programs and so it is pointless and even harmful for us to talk about possible reasons.
There are possible reasons to support these programs, but they're not legitimate or sensible or reasonable or good. And that's precisely why it is harmful to talk about possible reasons to support these programs. You make it harder for people to be sure in their own minds that they are as fucked up as they seem, which makes it harder to build resistance to them, which is an urgent necessity. It might sound like what I'm talking about is immaterial, but it's not. To build resistance you need morale, to have morale you need at the very least to have the surety that you're right. To participate in the endless repetition of half-baked, rational-sounding defences of the indefensible is to make it harder for those who want to attack the indefensible to believe that they're not crazy. But we need them to believe that they're not crazy.