Need to vent over scams and taking advantage of the vulnerable

Yesterday morning my husband “ who as been diagnosed with vascular dementia “ walked into the kitchen and started telling me about this amazing supplement endorsed by Bill Gates that could stop or reverse dementia, but it was really expensive and he was hesitant to try it. I knew immediately it was a scam, however I didn’t say anything because he just sounded so hopeful, at the same time my blood was boiling over people taking advantage of the vulnerable. After thinking about it for a while I decided to look up information concerning the ad so I could show him the truth, thankfully he accepted it and understood, but it got me thinking about all the other people that don’t have a advocate for them and they fall for these scams. I still feel so disgusted and angry over the hold thing.
I wanted to share to maybe prevent someone else from falling for this and to also ask has anyone else been through this and how did you handle it.