The more appropriate analogy is that trading stocks is like gambling. And it's not even analogy. Unless you really know what you're doing, trading stocks is gambling, just with less house edge.

Stock trading is to wealth management as opiates/painkillers are to pain management. Both can be part of a larger strategy that leads to an optimal outcome while minimizing risk, but the average layperson might not be able to accurately gauge/understand how minimize this risk. The argument then is consumer-facing stock trading services create a moral hazard similar to the one created by unscrupulous doctors or your neighborhood drug dealer.

Markets are like crack: very addicting. Futures especially. It can be an unhealthy obsession where you cannot sleep, constantly doing a prediction loop watching where the market goes 24 hours a day, sleep deprived, drawn to the ticks up and down.