WASHINGTON — A jaw-dropping report by ProPublica detailing how America’s richest men avoided paying taxes has intensified interest in Congress, even among some Republicans, in changing the tax code to ensure that people like Jeff Bezos and Warren Buffett pay their fair share.For Republicans, the idea that the tax code should give preferential treatment to investment has been sacrosanct, ostensibly to promote economic growth and innovation that could benefit everyone. But the news this week showed how the treatment of stocks, bonds, real estate and huge loans taken off those assets has sent the tax bills of the richest …
