Boomheadshot
Sure, if someone asks if they can tag along and I'm in the mood to make small talk with a stranger, then I'll run with them.
But if I'm out with a friend running having a personal conversation and then some random person decides to speed up and latch on right behind us without saying anything, then I will take action, whether that be talking to him, speeding up, or slowing down. Why am I obligated to let someone join me or move to "some rural armpit" if I desire some privacy from a stalker?