Hello Imad,
The large levels of debt carried in the Eurozone and the wider EU are matched by large debt levels in the United States and other nations, too. In answer to your question, yes, someone within the governments of each of these nations had to 'see' the debt levels growing. However, much of the debt was taken on in order to offset the drop in economic activity during the global recession of 2008-2009 without much of a plan about how to lower those debt levels after the crisis subsided. That said, people do not tend to deal with problems until they are at a crisis level so 'seeing' the crisis and 'doing' something about it are two different things.
With smiles,
Jason