Why did labor electorates receive more infrastructure grants?

Voters in Labor-held seats received the bulk of the funding after the Albanese government allocated more than 73 per cent of the $560 million Major and Local Community Infrastructure Program to electorates it holds, according to an independent Centre for Public Integrity analysis. The report has prompted accusations of political favouritism and pork-barrelling against the government, though it does not itself explain a specific justification the government has offered for the imbalance [1, 2, 3].