People with 'Support the Troops' bumper stickers: why?

I left a message board back in the day because when I mentioned my husband was deployed I got told they hoped he would get killed because he was military and involved in the war.

The blue goose flies at midnight.

This is timely, because yesterday I saw one that said “If you’re not willing to stand behind our troops, feel free to stand in front of them.” I wonder how many people this person met that hate the troops…apparently enough to purchase a bumper sticker that advocates their death.