> What "evasions"?

You kicked off this subthread by saying (among other things):

> the other side actually has reasons that you haven’t bothered to consider?

In response, it's entirely reasonable for someone to ask you to speculate what those specific reasons might be whether or not you agree with those reasons. You suggested those reasons exist, asking someone who expresses confidence they exist is a reasonable place to start.

Here's one of the ways that you're evading answering that question:

> I have repeatedly said that I don't support the policy.

No one here required you to publicly marry yourself to the policy. We're all aware of situations where we can speculate on possible reasons for a position without agreeing with it in the end. So saying "I don't support the policy" is a non-sequitur.

If you don't want to answer the question "what reasons have I failed to consider?" one way of resolving the tension left by your assertion that such reasons exist would be to say something like "I don't want to speculate on specifics, I acknowledge that this weakens any assertion that such reasons exist, but I still think we shouldn't just call the reasons given dishonest." Perhaps there are other ways of resolving that tension.

But saying "I don't support the policy" is not in any way adequate. You were not asked whether you support the policy, you were asked to back up your assertion that "the other side actually has reasons that you haven’t bothered to consider."

> I want you to tell me why you believe that

I don't think I've personally staked a position in this discussion regarding the administration's policy, much less whether or not they're lying, so it's not clear why I'd have any obligation to defend a position before we hear what your reasons are for asserting the administration "actually has reasons that you haven’t bothered to consider."

It's also not clear why someone who has staked a position that the administration's reasons are pretextual and dishonest would be obligated tell you why they think that before asking you to back up your assertion that other reasons exist, though of course you are also free to ask people why they believe something (and some people have at least mildly elaborated on specific reasons they believe the administration is not honest).

And I understand perfectly well what Motte and Bailey means. I specified exactly what I identified as your Motte (“maybe they have honest reasons that aren’t anti-immigrant, ever think of that even though I won’t speculate on what those would be”) and your Bailey (disavowing any investment in defending the new policy). Repeating your Bailey does not defend your Motte. Insisting that people are misrepresenting your Motte as a defense of the new policy does not defend your Motte, it is simply repeating your Bailey.

Your original position was "the other side actually has reasons that you haven’t bothered to consider?" and you have retreated to "I don't defend this policy so I have no obligation to defend my assertion that the other side has actual reasons I just want better discussion."

If you want better discussion, an explicitly acknowledged retreat from "the other side actually has reasons that you haven’t bothered to consider" will look more honest and less evasive. You could also speculate on what those reasons might be, and that would also strengthen your asserted position that "the other side actually has reasons" to the extent those reasons look credible.

Some people may also be considering the possibility that your claim that you disagree with the administration's position is not honest (as well as approaching the admin as dishonest actors). That's always discouraging of course -- we certainly want to be perceived as honest when we believe we are, and it's also convenient to be perceived as honest even when we are not. I haven't staked my criticisms of your engagement on whether or not you are dishonest: I allow room for the possibility that you're honestly wrong, and even some for the possibility that you may eventually make a substantial counterargument as yet unconsidered. Still, dishonesty is a real possibility to be reckoned with, and bringing it under consideration is reasonable enough. In that light, reducing reckoning with that possibility to "just screaming 'liar!'" also looks like rhetorical evasion.