Went to a Parks & Rec meeting about this course proposal on Monday...
Basically this park was saved as open space a long time ago by a community hero, Anna Jean Cummings. It was going to be developed into housing tracts, and getting this land into county parks was a major victory for advocates of open space. The park is already heavily used, such that introducing disc golf into the park feels like an impingement to the long-time park neighbors who walk and decompress there daily. Imagine if somebody came to your well-established disc golf course and said you would need to share the space with archery ranges alongside all your fairways, and you'd have a good idea of how these people feel (even if perfectly safe, you'd lose some peace of mind). Thus there are very good and understandable reasons to oppose installation of this course.
I don't think the opponents needed to employ such hyperbole and attack disc golf in general, just to make their point. White egrets hunt gophers in all our parks, around here they are just regular birds that eat vermin. Getting hit by a disc can hurt like hell and leave a bruise, but that's about it, it isn't a flying circular razorblade and very few players can throw over 40 MPH (and those usually have more aiming skill). The dogs running off leash in this park do much more damage to bird habitat/nesting sites than disc golfers would, the environmental objections to disc golf have been way over-stated. The natural habitat in this region was destroyed in the late 1800s with deforestation of the old growth redwood stands.
In any case, I think there is a lesson to be learned in all of this: don't ever try to install a course over the objections of the neighbors. It will never work, and all the negative energy created in the process can harm or distract from other more worthwhile projects.