Rescuing insects from spider webs

i think you’re missing the point. If you kill all the predators, their previous prey have population explosions and starvation. Yeah in a sense it’s sad that life forms eat other life forms but unless you are going to direct a comet into earth to end all suffering like some video game or Marvel villain, helping prey is at best making yourself feel better over something that didn’t actually offer any net benefit. At worst you’re just arbitrarily choosing favorites. Would you shoot and kill an elephant to save an acacia tree? And no doubt the acacia tree is shading some grasses out or taking their water so really, you’d have to kill everything.