"The Southern Poverty Law Center (SPLC), for example, operates an online “hate map” that gives addresses of Christian organizations..."
Actually, the SPLC's "Hate Map" doesn't provide any addresses or other verifiable information beyond a state and sometimes an alleged city or town. That's what makes it such an effective fundraising tool. If you look closely at the "Hate Map" tool, you find that they didn't even bother to make up a town name for more than 200 of their alleged groups.
The SPLC doesn't provide addresses because they don't have to. No one in the media is going to examine their claims so they can just make up any numbers they want. If they did provide basic, verifiable information, anyone off the street could debunk the SPLC's fundraising propaganda on sight and that would cut into the profits.
Last year, well-meaning people took the SPLC's spurious "Hate Map" numbers as authentic and sent in more than $40 million donor-dollars, which is more than $103,000 dollars every day of the year. That amount does not include the $36 million in tax-free interest generated by the SPLC's $281 MILLION dollar "Endowment Fund."
Vaya con Dinero, SPLC!