A couple of times the seeds I've bought have been "de-tailed" -- and didn't have that handle.
And, like Eric, I've never planted them "like a dart," either... whether it's in 6-packs in a flat, or direct sowing in the garden.
Since marigolds are grown in grade-school classrooms, I think as long as they aren't buried so deeply that they just can't emerge they are pretty foolproof!