How about for the things in his memo that were not truth? Sure, there's a bit of truth in it. There's much more that's debatable at best, and some that's pretty clearly false. How about for the totally off-topic nastiness toward the left, and diversity advocates, and others? Even in a memo about the driest of technical minutiae, comments like "honest discussion is being silenced" and "X tends to deny science" (with not even an attempt at proof on either point) would be worthy of censure. The memo was clearly written in a style more likely to escalate conflict than to create any positive outcome, so the reaction when Damore or one of his cronies leaked it beyond its supposed original distribution was entirely predictable. If you do something that simple diligence and common sense say would lead to a massive productivity-destroying flame war, you have something to apologize for.