What do you say to people who claim daytrading is immoral?

My thoughts are that we all have losses and we all know the risks. Don't trade if you don't want to risk your stuff, especially long-term swing trading. If you put your retirement fund into stocks, you do so at your own risk.

Just because I benefited from using the system to my advantage doesn't mean I am the one who is immoral. Everything has risk so you could argue anything is immoral.