I would recommend killing it. It's of no value to deer and used less by insects than most other similar plants - mainly wasps. I would rather have Goldenrods and other plants taking up the space. It can get out of control in some areas, but since it is an annual, once perennials take hold it usually limits the amount of it you will see,
The Native Americans used it to make an ointment to soothe piles (hemorrhoids). So if you decide to keep it you may never need Tucks again.....