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One points out that it was stated pretty bluntly that the Book of Darkness would absorb the entire world if not unchecked. Destroying Tokyo to kill it (temporarily) was a lesser-of-two-evils option, not a hysterical over-reaction to an imagined threat. No, Yuuno didn't actually see a world go foom, but given that by this point he's the expert on the Book outside of Reinforce herself (who doesn't contradict him), we can take it as settled fact.
One also points out that you don't know that the "old calendar" is a BC-type counting backwards. That's actually an unusual way to do it - the counting backwards would also be an artifact of the "new calendar", and the "old" calendar would reflect the previously-used dating system. Since the implication of that statement was that it was in some way influential in forming TSAB policy towards Lost Logia, it's sensible that it happened much closer to the TSAB's foundation than you've stated.
Keroko's right in that the manifestations of the Jewel Seeds that we see in the first season are entirely uncontrolled - the Jewel Seeds are not being manipulated by anyone with the least magic power (save Fate and Nanoha, who are busy sealing them, not unleashing them.) The one time we see some Jewel Seeds being intentionally used by a mage, Precia is attempting to open a pathway that involves destroying a dimension, and even the warming-up process is enough to cause an earthquake... in Uminari, in another dimension completely. It's not too much to surmise that (a) Precia-success would have spelled bad news for the Midoriya's cake sales, and (b) that the Jewel Seeds are packed full of punch for them who know how to use 'em.
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