You're not an idiot & PTSD isn't an excuse to treat people badly. It's a reason to learn the self control necessary so that we
don't treat people badly.
The line between symptoms, expressions, & coping mechanisms can get blurry sometimes. But at the end of the day whether I attacked my spouse in a nightmare (symptom), lashed out in rage (expression: See
PTSD Stress Cup), got drunk & picked a fight (coping mechanism)... I'm still treating my spouse badly. And that's wrong. Full stop.
There is no excuse for it. To continue the same examples, if I'm in a nightmare cycle I need to sleep in a different room, if my stress levels are rising I need to vent it in a controlled fashion (and clear my backblast)
before I'm exploding, and I need to stop drinking and picking fights & learn new / healthier coping mechanisms than drinking & fighting to deal with my symptoms. These things are all doable. PTSD is a bitch, but it's also highly manageable, when we take the time and effort and do the work to
learn how to. Not an easy thing, and not usually a fast thing, but a required thing.