Again, it was not a lie, that is how margin calls are supposed to work.

If you don't want it to work that way, you have a simple solution, dont use margin to trade complex financial products.

Look, i get where you're coming from, but the fact is that these are complex financial products that most people shouldn't use.

They are risky, and have non-obvious mechanisms inherent to them that make them dangerous, thats why he had to take a test before being allowed to trade them.

This was a depressed man who was trading in highly leveraged products and got spooked when he tripped over one of many stumbling blocks, and immediately killed himself over it.

Its a sad story, but there was no negligence here, and nobody to blame but himself.