Don't want your sim to get abducted? Lock their doors, and they'll have a route fail tantrum, but stay firmly on the ground. On a community lot? Buy a bunch of garden gnomes, which can be dragged to inventory, and then place them in front of exits. If they're outdoors, you could try placing the gnomes around them, though I haven't had to try outdoors yet. Share any other ways you know to avoid letting your sims get abducted.