All investments carry some risk, we do our very best to mitigate those risks. It is up to each individual to asses what their current risk tolerance is.
The Safe Mode is set up to prioritize the utmost stability even at the expense of possible greater returns. The logic and diversification has produced steady gains in a variety or up and down market conditions with conservative trades and strong safety net.
Aggressive Mode favors logic that will make trades resulting in larger profit but also experiences losing trades more often than Safe mode. Aggressive mode still has substantial diversification and stop losses utilized to manage the portfolio as safely as possible while favoring higher returns. There are no express guarantees that Aggressive mode will always be profitable.