I don't understand why you think giving a red card will result in a lesser sentence than a citing?
Perhaps because I am not saying it currently will, but rather because a citing commissioner can look at the actual evidence, and so can whatever tribunal decides to do next.
There are some offences in rugby which might be punished much more seriously than they are by "us". Quite a lot of dangerous tackles for example are not deliberate, just a natural result of what happens when you throw two big bodies at each other often enough.
This incident was certainly deliberate, but in the opinion of WB clearly not seen as threatening. Imagine the exact same push on you after a player has been penalised, without him stepping back, I'd imagine most of us would consider that an act of "lèse majesté", yet it seems to happen in that game with a round ball (at the very least figuratively) all the time.
If a court of law had to rule on whether this was assault, I'd struggle to see them find anything but innocent, because it clearly wasn't assault.
Again, I agree with those who thought it should have been red immediately, simply to set a standard. In retrospect, perhaps WB wishes he had done so now, and I believe that a message has been sent should anything like this happen again, at any level, a RC is appropriate.
The player is unlikely to make the same mistake again, regardless of what the suspension term is.
All I'm pointing out is that since he hadn't been carded in the game, it became a choice of LE 24 or doing nothing. No middle ground would have been left. I'm not even saying that a lower category of offence should have been used, just that perhaps it could.
Hope that helps, my apologies if I remain unclear.