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Stefano, 
go look at the diff - do you see anywhere in the text that you put a reference? You have to cite your sources. Period. End of story. You failed to do this, so it got removed.
What the heck is ""segnalation""? That's not an English word.
Claiming that this policy allows to 'delete unsourced datas' it's again a fantasy interpretation. This is not a fantasy interpretation, it's the basic policy. In the first paragraph of WP:V it reads, ""Editors should provide a reliable source for quotations and for any material that is challenged or is likely to be challenged, or it may be removed."" (bolding for emphasis).
Don't complain about being unhappey when being rolled back. Many, many editors have tried to give you positive, constructive advice on how to edit so that you don't get rolled back, but all you do is ignore their good advice and whine about things. When are you going to realize that these editors aren't against you, they're trying to help you while keeping the quality of the articles up? ''''''Speaketh "