It's kinda like saying people can be reasonably healthy and still smoke some cigarettes. True enough, but if someone is trying to be healthy that's a pretty obvious change to make.
Wine would be a better analogy. It contains a large amount of a known carcinogen (alcohol), but plenty of people who try to be healthy don't feel particularly guilty about drinking some wine every now and then.
I don't know if it's a better analogy, but I agree that it's a good one. There are tons of things that won't outright kill you on first exposure, but are good candidates for minimizing if you want to improve your health.
I don't think I ever considered drinking from cans healthy, it is just a desperate move if no better option is present. Same beer tastes significantly worse compared to glass (but if you drink cheapest crap you probably don't notice nor care).