Earlier quoted context omitted.
>Tariffs are flat taxes on corporations The OP said tariffs are not progressive taxes. You are agreeing with them while believing you are disagreeing. Further tariffs are not specific to corporations. Individuals pay them. Small business pay them. Large businesses pay them.
Then you would agree that all corporate taxes are not progressive and are eventually paid by all consumers thus all corporate taxes should be abolished.
(I'm not committing myself to the idea, only that it isn't obviously outside the norms of economic thought)