I think a bit of context is needed here....
1) Thomson and Lillee had just brutalised the Windies batting, sending quite a few of them to hospital, and the Windies took it basically without complaint. Lillee and Thomson bowled to deliberately hurt the batsmen, so Lloyd realised that this was a legitimate tactic, and used it against the Indians at Sabina Park.
2) This passage you quoted from Gavaskar's book gives an idea of the antipathy that existed between the teams: "Gavaskar, in a passage from an early volume of autobiography, "Sunny Days", made the inflammatory comment, when dealing with the vocal encouragment given by the locals to their quick bowlers, 'All this proved that beyond a shadow of a doubt that these people belonged to the jungle and forests instead of a civilised country.'"
3) Michael Manley was present at the match, and he made this observation about Gaekwad's injury in 'The History of West Indies Cricket'. "Gaekwad's injury was exactly a replay of England's captain, Bob Wyatt, facing Martindale forty-one years before on the same ground and batting at the same end. Both the England captain facing Martindale and now the Indian batsman facing Holding assumed a ball of great pace would lift. Both ducked. Neither ball lifted and both might have been killed. Happily both survived."
4) "Vishwanath had suffered a broken left hand when caught at leg slip off Holding."
5) "The case of Patel was completely different. He jumped down the wicket to hit Holder out of the ground and, having taken his eye off the ball, it flew from the top edge and he was struck in the mouth. At this stage Bedi declared to ensure that neither he nor Chanderasekar would have to face the bowling." Let's not forget that Vanburn Holder was little more than a medium pacer....
6) "Bedi and Chandrasekar had hurt their hands attempting return catches during the West Indian innings."
7) In his autobiography, Holding says that on reflection, he felt that their tactics were not in the right spirit of the game, and that they shouldn't have bowled around the wicket to the Indians.
8) Lloyd is understandably unapologetic in his biography by MacDonald: "We had a whole lot of problems, but the main one was that our batsmen were frequently exposed to Lillee and Thomson, still fresh and still raring to go with a relatively new ball. Our players all round were put under constant pressure by sheer pace on some very quick wickets. And many of us were hit. I had a double dose. I got hit on the jaw by Lillee in Perth and by Thomson in Sydney. Julien's thumb was broken, just when we felt he might help solve the problem about our opening batsmen; Kallicharran's nose was cracked by Lillee in Perth and everyone at some stage during the tour felt the discomfort and the pain of a cricket ball being sent down at more than ninety miles an hour. But that's the game. It's tough. There's no rule against bowling fast. Batsmen must cope to survive." Basically, Lloyd's saying the WI put up with this in Australia, so they were just dishing it out to India, and you can see the logic.