I think a lot of the reason why people are against jump shots is mosly whining, like the reason why people want call-shot in every game. They're angry that some player they thought should not be able to escape a snooker, did. I've seen plenty of people become instant converts to the call shot angry mob, when a player slopped a ball in against them. There is a good defense against this kind of anger, and that's to become better than those people, and not give them unnecessary chances by playing mediocre and poor safeties. Also, don't assume that you know what a player can and cannot do, especially underestimating, or you're bound to be negatively surprised at the least opportune moment.
I see a certain connection between people who play very negatively and passively and simultanously are all about call-shot and no jumps, it's doesn't apply to all, but a sizeable chunk of them. These people think they can just play the game mathematically and they'll always win. Some of them are kind of lazy and complacent about their game, never working much on their physical skills. They forget that this isn't chess, but a physical game. Like in martial arts, if you can't punch hard, if you're weak as a kitten, you'll lose to opponents who know less than you. You can't leave people half chances, because people will take advantage at least some of the time. Sadly, sometimes you play someone in dead stroke, and the maths doesn't work the way you think. You're rarely going to win playing passively against good competition and you need to be able to shoot to win.
These people are attacking their problem at the wrong end. They want to stop others from doing things, that they instead ought to learn how to do themselves and they refuse to change their strategy to the realities in the field. That never works out.