Except it wasn't a bad decision at all, it was an incredibly close fight no matter who you thought "won". It was the right call to make. If either guy won you'd have people on both sides calling bullshit, far moreso than if it had been draw.
Even if you gave Wonderboy 2, 3 and 5, Woodley should have gotten a 10-8 for 1 and 4.
Round 4 because it was just a brutal beat down. Round 1 because Wonderboy threw exactly 1 kick before getting taken down and mauled for the remainder of the round. Woodley threw something like 50 shots to Wonderboy's one, dominated top position and landed elbows that cut him while he had his way with him.
That'd give you a 47-46 scoring.
If you watch the fight without commentary like I have, you even have an arguably win in round 3 for Woodley, given champion's benefit as that round was actually pretty close, which is what happened on one of the scorecards.
Then again, it doesn't help that the scoring of the bout was all over the place.
Crosby gave Woodley a 10-8 for round 1, but only a 10-9 for 4, despite the fact 4 was a much worse beatdown than 1.
Cleary gave Woodley a 10-8 for round 4, but, like Trowbridge gave round 1 a 10-9, despite it meeting all the criteria for a 10-8 round, i.e. control, aggression and dominance - and make no mistake, that round was nothing short of one-sided dominance.
Trowbridge did get it right with round 4 being a 10-8 and gave him round 3, which I'd say is fair given how close it was and how the champion's benefit comes into play, so I find it scoring more forgivable overall.
tldr; the scoring in Woodley/Thompson was just a mess. Ask anyone who they'd rather have been in the fight though, and you'd get an overwhelming number of replies saying Woodley - who was never once in any danger and completely neutralised Wonderboy's most dangerous assets. This fight was scored a draw, but it shouldn't have been.