Personally andI know full well that a hail of bullets will be likely but that's fine, I think that condolences are useless, likewise sympathy. My parents died decades ago and all the sympathy in the world would not have made me feel any better. No-one would have felt my pain, it's just the correct thing to say.
As it was, I went in to work the next day and didn't tell anyone, after all, what could they say or do which would have comforted me? I would have likely put them in the uncomfortable position of offering sympathy, hugs and back patting which would have just prolonged the hurt.
I have wonderful memories of parents who gave me a magical childhood and a tough spirit so there is nothing to be sad about. They wouldn't have liked the way the world has changed anyway.