I'm rather confident that there is text explaining that it's riskier.
EDIT: Reviewed the in-game text and the risks warning could be more explicit. Please submit a bug report for a text change.
My issue is I assumed once I put it in I had it, and that by using the stealth option I was decreasing the risk of local troops stopping me. I feel I should get the 50% back that you get for command failure.
