Is it frivolous to post about science fiction given the present state of the world?
No. It is possible to appreciate fiction while addressing the state of the world which unfortunately will probably be bad for a long time yet.
Is sf escapist?
Some is. However, some other works of sf address serious issues, e.g., see:
Serious Issues;
Issues In Mirkheim;
War, Wells And Anderson;
Cold War SF
Thermonuclear Warfare And James Blish
Fiction And Non-Fiction
Church And State
"The Old And Protean Enemy"
Future Politics
The Wardens' And Rangers' Time War II
The Sensitive Man
What We Expect
Remember Wells
Mankind
Synthesis And Sensitivity
More Background Details
Some References In "The Sensitive Man"
A Note On Draka And Psychotechnic Politics
Comments On A Debate About The Future
The History Of The Science Of Society
A Debate About The Future
Flandry's Theoretical Understanding