That was a time before modern communications technology made it very easy for knowledge of higher standards to spread naturally, and a time of much less dangerous advertising. Advertisers today literally use brain scanners to design adverts that manipulate people most effectively. See: https://en.wikipedia.org/wiki/Neuromarketing And advertisers have the ability to test and refine their ads far beyond what advertisers of Roosevelt's time could do, using tracking that would be considered stalker behaviour if an individual did it. If advertising reverted to 1930s level there'd be much less need to defend yourself from it.

"By the way, if anyone here is in marketing or advertising...kill yourself. Thank you. Just planting seeds, planting seeds is all I'm doing. No joke here, really. Seriously, kill yourself, you have no rationalisation for what you do, you are Satan's little helpers. Kill yourself, kill yourself, kill yourself now. Now, back to the show. Seriously, I know the marketing people: 'There's gonna be a joke comin' up.' There's no fuckin' joke. Suck a tail pipe, hang yourself...borrow a pistol from an NRA buddy, do something...rid the world of your evil fuckin' presence."

- Bill Hicks

You know people once thought tobacco was good for their health too.

I don't know if this quote is true but advertising in Roosevelt's times was really different. It was not a creepy tracking business tracking everything you do and traditional advertising was much less present everywhere back then.