Razor And what it has to do with me?
Well, at least it should prevent you from further using their "service".
How can u be sure they actually did that?
There are the technological means, to manipulate large parts of the population, there are people who have undertaken considerable efforts to do exactly that, these people have proven connections to the campaign of a politician highly considered as a candidate without any chance and that politician was then elected against all odds.
I don't need to be 100% sure, the given 99.9% are enough for me to be deeply concerned. And even if the percentage would be considerably lower, the disastrous consequences of the potential to manipulate elections would be enough for me to raise all possible alarm bells.
I am not defending them, it's just that i do not like when people are paranoid without a reason.
So you don't see any reason to be concerned?
Like there is only now a privacy issues etc, it was like this from the start
Correct, there was always a privacy issue. That's why I never had a Facebook account.
But Facebooks negligence to prevent the misuse (or rather their intent to enable exactly that, as this is their business model) has turned this thing into much more then a privacy issue for the easily tricked. Now I'm affected by Facebook too, even without having an account, as I have to live with a POTUS Trump and the fallouts of the Brexit decision as well. So forgive me if I refuse to not care.
and what is changed in my or any other lives?
You really don't see it? Could it be any more obvious?