I'm not sure I favor your tactics. The neighbors are just as likely to cut them down. You could tall to them about the importance of shaded areas for cattle, and offer to pant some fruit trees there that would provide that and fruit to boot.
Fruit & Fruit Trees
A community to discuss fruit trees, fruit forestry, fruitarianism, and all things fruit-related.
Post photos of your fruit trees or harvests, share growing information or interesting articles, ask questions, or just express your appreciation for fruit in general!
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Banner photo of Pereskia aculeata by Lumicon (CC BY-SA 4.0)
Sometimes I do ask neighbours for their permission to plant fruit trees on their lands for our mutual consumption, but I don't negotiate with animal abusers.
If your actions result in nothing, do they still carry any meaning?
Sure. I take pride in planting fruit trees regardless of the result. Plus, anything that makes life more difficult for the cattle ranchers means that they have less time and energy to devote to cutting down more of the forest. But I suspect that at least some of the engkalas will survive to adulthood. They want to sell that land anyway.
How tasty are them? Those fruits are so colourful
Very tasty! Not on the level of something like durian or chempedak, but very creamy and savoury and satisfying. Fairly easy to make a meal of them. It's a bit of an acquired taste, not in the sense that isn't appealing from the start, but in the sense that it gets better and better each time that you eat it. Highly recommend.