I do not know with the laws of your country but as for us, we were earlier told that we are investing at our own risk. Hence, we assume all risks shall we fall victims of all types of fraudulent acts. Having said this, it is thereby even more unsafe to trade through a third person.
Well brokers probably have more kniwledge than us with how to react or move based on the market's status, but i don't personally feel comfortable letting someone else trade my money for me. I think it's still a lot better if you study and learn yourself so you wouldn't have to let others do it for you