(i) Miners, not average users, hold the voting power.
(ii) When the 1 MB block-size is congested (like it is now), miners make significantly more money on transaction fee's.
(iii) Increasing the block-size increases supply and reduces demand for priority processing in the block, hence, reduces transaction fee's.
Which explanation truly matches your view of reality here. People (miners) are motivated by "A shared vision" or a dollar in the bank account? Look at it closer (quote from parent comment):
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> "larger blocks means more resources required to transmit, validate and store blocks and if you cannot validate blocks, then you are trusting transaction validators (miners)"
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Can you see the problem with the explanation now? Its written from the view of an end user (of bitcoin), not a miner. But its miners who vote on the fork, hence, the above quoted text is mostly irrelevant to understanding the "WHY" of the fork battle.