No, ground meat is good, it's also cheap.

But in burgers you get bread, potatoes, seed oils, etc, which are all bad.

Example: its extremely hard & rare to become or remain fat in keto/carnivore.

Heme iron and its link to oxidative stress has been re-evaluated over time.

Vegetables contain non-heme iron (Fe 3+), which is reduced to (Fe 2+) by the body on demand for absorption. In contrast, heme iron is already in its reduced state (Fe 2+). Because of its high bioavailability excess heme iron reacts with peroxides to produce highly reactive free radicals (Fenton reaction).

You can keep on potatoes safely.

potatoes are high carb and no protein/fat, while foods should be high fat and low-to-medium protein (in keto diet that I do).

I was responding to the carcinogenic aspect of meat, not to you personal diet. You can ignore it ("It is not") but it doesn't make Fenton reaction less real.

The "longevity" aspect on both ends of the spectrum is very hard to really quantify to be honest.

On keto/carnivore I see immediate results (weeks) that span over multiple years.