be careful of assuming you know what everyone feels. i do not experience depression. i have seen many throughout my life who do and cannot relate. when i experience negativity, i revel in it, as much as i do joy. paralysis is brought on by lack of options to affect a situation. i can always see options.
self pity and self accusation seems to be the reinforcement of this paralysis in the people i have seen with depression. i do not know this first hand, as i said.
if i think outside the path that i have been told is the only way, i have never found a lack of options. the magnificent universe is made of these. all that is required is the will to recognize them and seize them.

i do agree that many things make this easier. your post covers these quite nicely. thank you.