Let me point out the obvious salient point here: it is a FREE speech issue and not a bumper sticker issue.
However let me say as an aside that freedom of speech is still legal in America I believe. Pulling a gun on the apparently deranged Obama claptrap old man was not necessarily the best way to express that right (even though I understand the younger man completely) but I wasn't there and don't know anymore than anyone else here what actually transpired. But I too just might know how the armed vet might feel, I too have been verbally assaulted by a whacked out nut-job Obama knee padder and I was awfully tempted to do what the young veteran did.
We have our share of whacked out nut jobs ourselves.
But again, why say Anything to someone about their bumper sticker? It is no one’s business. Sorry to belabour the point. It just ticks me off.