Italy's self-financed debt?

If national debt is financed by its own households, according to common wisdom the exposure is not problematic. Italy has traditionally a high saving rate, and the national banks advertise government bonds appealingly.
Probably a good share of household savings go into BOT, BCT etc.
But the saving rate has diminished  from >16% to 7.4% in the last twenty years.
When experts bring up the high saving rates argument, I can't trust them.

http://www.gfmag.com/tools/global-database/economic-data/10396-household-saving-rates.html#axzz1RpkjkzTb