Two ideas can be perfectly valid at the same time, even if they conflict on some points, and the ideas likely exist on a spectrum of possible views with neither Team A or Team B truly being at the logical conclusion of their ideologies.
Likewise, it's perfectly valid to know something is good for the environment on paper, yet still "feel" like it's the wrong thing. Humans are not calculators, and whether or not you'll get the right outcome from going by your feelings, you're fully entitled to them all the same.
What’s so extreme about disagreeing with releasing genetically modified organisms into the wild? Even if a person believed that some combination of both options should be done instead, that person would still, by the end of the day, decide to disagree with releasing genetically modified mosquitoes in the wild as it is currently being done precisely because it is not how they believe it should be done. The extremists-fighting-over-false-dichotomies narrative is honestly so tired and lazy, IMO.
Only in the narrowest sense.
Another valid response is "you can't do this as-is, but if you make changes X, Y and Z then you can." Or "do more experiments with captive populations first." Or "do this in an area where it's less likely to cause unexpected side effects (eg an unpopulated island somewhere)" Or "use a different set of genes or tweaks"
It's pretty rare that the _only_ possible choices are to do this _one exact thing_, or do nothing at all.
You may think it’s narrow, but whenever you can decide between yes or no on an action all arguments considered, that could just mean that the action itself is clear and specific, as in this case.
I completely disagree with you sir!
"I'd like to have an argument, please."
I don't mean to claim that this is always bad or inappropriate. Just that it's the in thing to do these days.