Antiwar is a complicated word.
If you have antiwar thoughts/opinions but vote for a pro war candidate then im sorry you are not antiwar because you are not antiwar where it matters.
It is by far mostly independents that are antiwar
The real issue is you have politicians that say one thing when they ate campaigning, but switch there while style up when they get in office.
Remember when BHO was talking all this antiwar rhetoric, getting out of Afghanistan, and somehow

received the Nobel Peace Prize before he a actually did anything in office........he then went on to drop more drone strikes than Bush and open up new war fronts in 3 new countries.
Trump was way more antiwar than Hillary, but he low key has been still back and forth. What's crazy is you have people on the Left upset when he announces removing troops from Syria

.....
I agree with you though, an Independent outlook is best approach.