Yes indeed investment anywhere is not always safe and has a high risk because we get profit from fluctuations, we cannot get it for sure. So that we have to be careful and do overall consideration in order to avoid these risks. I agree with what you say that invest anything we can lose. Because we must always be ready with the results that will be obtained.
There is no gain when you do not take the risk though. Our life always succeed on every challenges and find a way to get out and rise again. We cannot predict about the result easily when we invest but we do not have to wait with nothing. Invest what you afford to lose and diversify them.