I'm not saying West Indies' behaviour wasn't appalling in all those ways you state. I'm not saying Croft was remotely in the right in his antics through the course of the series. There were, of course, several other occasions over the course of the '76 to '86 decade where West Indies' behaviour was appalling - never more than the Sabina Park and Old Trafford Tests of '76. Colin Croft in particular is actually a bowler I've generally had little but contempt for as he constantly pushed the boundaries of what was acceptable in several ways. I'm glad I don't have to acknowledge him as anything other than someone who was good for a very short time. I'm glad I can put him comfortably behind the likes of Roberts, Holding, Garner, Marshall, Walsh and Ambrose as seamers. Despite the fact he seems to have mellowed a bit and is tolerable as a commentator, though someone who Brian Lara has always had little time for.
However, I am saying that if the Umpiring had been of good standard in that 1979/80 series, and "out" decisions which should have been given were, then West Indies would have won it. Regardless of how awful their behaviour was, had correct decisions been made they'd have won.
I'm also rather surprised you've seen filmed footage from said series as I never even knew any existed - else, obviously, we'd be able to say with more than guesswork whether there truly was the number of poor decisions in New Zealand's favour that rumour has always had it there were. About the only thing I've ever seen from it are a few stationary pictures, most notably the famous one of Holding kicking the stumps. Where did this footage come from, and is it of the normal format?