Palm oil is just an oil like any other, solid at room temperature which makes it useful as a butter/lard/tallow replacement intrinsically it is no worse or better than any of those others. Just because the places you normally see it are unhealthy doesn't mean it has to be an unhealthy addition to the diet. It's the same problem as any other thing us humans do. a couple of palm
trees here and there is no issue to anything, the same as a couple of
chickens, cutting down a forest to plant 10,000 of them is a problem as is packing 10,000
chickens into a barn feeding them antibiotics and polluting the groundwater with their effluent. It's all a matter of scale.
Assuming it's not to difficult to process then I cannot see any reason why people who have the climate to grow oil palms shouldn't as part of a diverse ecosystem.