You point is true for all organisations that cover many issues, and do not concentrate on one single small issue. You end up not donating to anything, even if your donation would have a large net positive.
Tagging money for specific issues is problematic because the organisation doesn’t change its budget percentages for small donations (money is fungible), and organisations find tagging difficult to manage [TODO insert article link here].
I've been in organizations that allowed earmarked donations for certain funds / projects. The ACLU can totally allow earmarked donations for projects they are undergoing.
Ex: A policy of %80 towards earmarking & %20 towards the general fund to help boot up new projects / general admin would be totally fine with many donators.
Tagging money for specific issues is problematic because the organisation doesn’t change its budget percentages for small donations (money is fungible), and organisations find tagging difficult to manage [TODO insert article link here].