Because the actual value corporations provide is only in their profit. Whereas the economic value individuals provide is measured by their compensation. It's completely incoherent to tax a corporation based on revenue. If profit margins are an average of 5%, what exactly would you want the tax rate on revenue to be that wouldn't immediately put out of business nearly every corporation on earth?

And if individuals got to deduct everything they spend money on, then everyone would be incentivized to spend their entire paycheck every year and never save money for retirement or anything.

So the reasons we tax corporations on profit and individuals on income doesn't just make sense logically from a point of measuring economic value, but is also literally the only practical mechanism.

And just to check, you really want most of journalism to go out of business?