On the one hand you have billionaires pouring hundreds of millions into elections and politicians/judges tax-free (https://en.wikipedia.org/wiki/527_organization), and on the other hand you have unilateral declaration of any nonprofit organization (https://en.wikipedia.org/wiki/Nonprofit_organization) as "terrorist supporting". Do you really think that tax-exemption of the latter is the problem here?
From wikipedia: nonprofits include political organizations, schools, hospitals, foundations, social clubs, etc