They don't care about our health. If they did, cigarettes and booze would've been banned LONG, LONG ago.
You haven't seen any bans on all the different Schnapps flavors, seems a bottle of that ingested by a child would be no better than e-liquid. Common sense would tell you that the smells would surely be just as appealing (for either) to a child. No child proof caps on liquor here in the USA. I guess a capped bottle of beer would qualify, or a corked bottle of wine, but many bottles have twist caps. So that child proof banter (in my opinion) is a crock.
I completely understand and agree with the underage ban. I honestly don't have a problem with basic rules for health and safety guidelines for mixing labs either.

Pure nicotine is extremely dangerous in the hands of untrained handlers.
Basic safety measures for the general public. I'm fine with that...but honestly, a lot of it is an extreme overreach of power from the govt. Bottom line is, you can't "protect" everyone from everything. You just can't. At some point people have to take responsibility for smoking, vaping, eating, drinking, dangerous recreational activity...etc. There are a lot of dangerous activities out there, how many children are killed or injured while riding bicycles every year...do we ban that??? Anyhoodles, you get the idea...I could go on and on...