Its like claiming its impossible for that bottle of whiskey to sit, undrinking, on my basement bar top, whiskey can only either be chugged immediately or angrily poured down the drain. Its impossible that bottle is sitting there without my drinking it.
I assure you, despite your claim that its impossible, I have a mostly full bottle of whiskey on my bar and an unused Facebook account. Why do you believe I'm lying? It seems realistic, reasonable, and a wise course of action.
The other reason deletion is pushed is to provide the illusion of privacy. You have no privacy anymore. Everyone important or actionable has total access to your entire digital life and always has and always will; the government, the banks, the big corporations. Its a false illusion that deleting your cat-meme-sharing account somehow protects you from the credit reporting agencies or the NSA. Its important to provide that false illusion of choice so that people are distracted from the actions of the credit reporting agencies and the NSA and the IRS and the banks and ...