How about Austria?Do we have ANY modern nation which is different from that what you talk about? EVERY nation/people is just that due to language and culture.
When we observe a quite young haplogroup as I2a1b, we can only see that its dispersion started from a geographically small place and that period fits to the period of Slavic expansion.
Practically, there's no I2a-Din outside the region of Slavic expansion. Even more, space/time components fits 100%.