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From the screenshot it looks as though the field you have assigned to color is a numeric value -- but is the field on the marks card green or blue? If it is blue (discrete) then you can use discrete color palettes (as shown in the screenshot). If it is green (continuous) you can use continuous color palettes which includes the diverging palettes you likely want.
If the field is currently blue on the marks card, try right clicking it and changing it to continuous.
Is the honest answer to this question that Tableau overlooked a simple palette that shows losses in red and profits in green? That is just silly. I hope I am missing something basic.
None of the sulutions I have seen to correct this are easy.