I never made any distinctions between ‘sci-fi’ and science fiction myself. When I hear either I actually think of ‘books’ first. ‘Speculative fiction’ is probably a more suitable broader term, but it’s never rolled of the tongue for me.
Here’s something I found a while ago, a list from a 1968 Galaxy mag of sci-fi authors for and against the Vietnam war. You might have to zoom to read it properly. I would take the pro authors over the antis on this one as far as which side I would want to read, if I had to choose. Asimov opposed involvement, Vance was pro involvement.
http://www.natsmusic.net/articles_galaxy_magazine_viet_nam_war.htm
Freegards
ANTI NAM
Issac Asimov
James Blish
Anthony Boucher
Ray Bradberry
Terry Carr
Samuel R Delany
Lester del Ray
Philip K Dick
Thomas M Disch
Harlan Ellison
Philip J Farmer
Harry Harrison
Ursula K LaGuin
Fritz Leiber
Barry Maltzberg
Judith Merril
Gene Roddenberry
Robert Silverburg
Kate Wilhelm
PRO NAM
Poul Anderson
Llyod Biggle Jr
Leigh Brackett
Marion Zimmer Bradley
Fredric Brown
John W Campbell
Hal Clement
L Sprague de Camp
Robert A Heinlein
R A Lafferty
Larry Biven
Jerry E Pournelle
Jack Vance