Many dragons (The Elder Scrolls 5: Skyrim)

Pereprohozhu Skyrim and here, for example, portula in Roricdel for wheat, was attacked by two dragons, and then look no this wheat, was burned by the dragons or local assembled?

Dragons attack often, even if you studied all the cries of every three times, and then they will attack, and will accumulate their souls, that is nowhere to spend it.

They should not attack often, there is not so much should be.
I believe that it feil to kill 10 five times the same dragon, it is a defect of developers, because dragons should be bosses in the game, filled up and no more ice dragon.