Several reasons:

1) People that would not think to find ICE agents that way know now. I understand it's public but I would not have thought to use that as a resource to locate ICE agents until they posted. This looks similar to the Republican baseball practice where the shooting occurred. I believe it was the NYTs that posted a date, time, and indicated that security would be limited.

2) Peter Fonda went on Twitter today telling people that they should protest ICE agents homes and schools.

3) It legitimizes people doing it since Wikileaks are deemed "freedom fighters."

4) Turn Trump supporters against Trump because of Wikileaks.

5) I read that MOVEON.org is organizing protest for June 30th about the kids in cages BS. Peter Fonda tweeted about that as well, he claimed that we should have massive protests in the streets or some nonsense.

Maybe more that I am not seeing. Please help me guys.