And Socrates was a suicide
Labels are often misleading and you have demonstarted that quite well.
I am not familiar with the bumper sticker you mentioned. The last conservative bumper sticker I recall was "Impeach Earl Warren". Liberal bumper stickers abound and are equally silly.
If you are convinced that your definition fits the typical academic and/or media type that likes to refer to themselves as liberal, I wish you good luck but I fear that you are being manipulated by a group that is self centered, elitist and has no more than a whimsical interest in the ideals that you express.
It is my unshakable opinion that Government is a good thing but excessive government perpetuates poverty, ignorance, illness, and prejudice.