Everything has risk, and difference is only more or less risk.

If investment is zero-risk, there would be no saying like "Invest what you can afford to lose".
If you understand the saying, you know there is risk of investment including Bitcoin investment.

You can believe it has zero risk but risk comes without minding about your belief and practice. Bitcoin
 is a best cryptocurrency and good choice for investor. However I really disagree and think you are wrong with you thinking.