For what it's worth, I think the only challenge out of the 3 in question that had any form of intent for dirty play is the one that didn't get a ban. For me, that sums up the current mess.
Byrne had zero intent for a high tackle - 4 match ban.
Lees had no intent to bang heads with Thompson (despite the nonsense on here from someone suggesting it wasn't accidental) - 2 game ban.
Dupree deliberately elbows Lees - nothing.
Strip away the shambolic system we have; if Byrne and Lees didn't get bans this weekend and Dupree did, I genuinely don't think any RL Supporter of any club would complain.