I don't know who you are because you're posting AC, and your post doesn't make much sense because I've frankly no idea what the fuck you're on about regarding Blair and being one of those people, one of what people? What are you talking about?
But no, I'm not trying to sneakily imply that 72% were in favour, what I'm saying is that whilst you can legitimately argue that AV was democratically rejected, you cannot say that FPTP is democratically supported because there wasn't a big enough turnout to give FPTP a legitimate democratic mandate, but there were more people willing to turn up to say no to AV than there were to say yes to it.
In fact, all the evidence shows that FPTP is not democratically supported, the problem is that AV had even less support. What people really want is something like STV but the Tories made sure that wasn't an option because they knew they'd likely lose the referendum and lose the benefits they personally gain from FPTP as a result:
And the slightly more biased:
Keep in mind also that these are polls on PR, so a large majority of people (even if you distrust polls after the election the gulf is so wide here that it's hard to suggest there isn't majority support) want PR, something that wasn't an option in the AV referendum. Of the 39% that don't want PR it is still perfectly reasonable that whilst they want to maintain local representatives, they don't want them elected under FPTP, some may even be AV supporters.
So yes, absolutely AV was rejected legitimately and democratically, but that doesn't automatically mean that FPTP has a democratic mandate. The thing that likely has an actual legitimate democratic mandate wasn't on the ballot, hence the 41% voter turnout, and that's why you can't claim legitimacy of FPTP - neither AV nor FPTP were able to command support of over 50% of the electorate.