Earlier quoted context omitted.
> The people engaging in this activity are worse than poachers Sausage is yummy, and pigs do ecological damage.
If poisoning pigs were known to be more effective than shooting, would that change the calculus?
Depends on a lot of things. Relative cruelty of poisoning vs. shooting the pigs; utility of hunters enjoying pig meat; costs & effectiveness of both strategies; etc.
I suspect you'd probably end up doing both.
On the other hand, it's a bit moot, because I don't think we know how to effectively poison pigs without greater harms. Texas was using specialty-warfarin in addition to the hunting efforts. It's arguably crueler than shooting them.
We definitely do trap wild pigs in many jurisdictions, but this is much less effective than shooting them, IMO.