I suppose if you have an external blog, you can simply summarize the potential criticisms on your LW post and link to a further discussion of them elsewhere. Or you can structure your post such that it discusses them at the very end:

<main point>

<explanation (includes a short list of potential criticisms)>

<summary>

======

Optional reading: <discussion of potential criticisms>

In this way you get your point across first, while those interested can continue on to the detailed analysis.