Weird, mine has almost tipped over twice because I forgot to put down a sidestand plate and the ground got soft. I've never had a problem with anyone knocking it over. YMMV indeed.
In my case, I will say I have never even attempted to park the Concours on soft ground... only on pavement (asphalt/concrete). There are several reasons for that:
1) I would never ride on non-pavement for fear of falling
2) I don't trust soft ground for parking
3) Most importantly- with short legs, I absolutely can't maneuver the bike on soft ground or gravel, I simply do not have the leverage to push it or man-handle it. Maybe if it were 4 or 5 inches lower.
That said, on my previous bike, I parked on a road temporarily once in extremely hot weather, just for a quick rest/stretch, and a few minutes later the kickstand was sinking into the asphalt...