Vegan fascists? The people who are trying to put an end to the forced captivity, continuous torture, rape, exploitation, commodification, and perpetual holocaust-levels of slaughter of virtually every species of animal that is not human, are fascists?

Here's the most commonly accepted definition of veganism:

"Veganism is a philosophy and way of living which seeks to exclude—as far as is possible and practicable—all forms of exploitation of, and cruelty to, animals for food, clothing or any other purpose; and by extension, promotes the development and use of animal-free alternatives for the benefit of animals, humans and the environment. In dietary terms it denotes the practice of dispensing with all products derived wholly or partly from animals.""

Emphasis added. The vast majority of vegans do not believe that killing a mosquito is exactly equivalent to killing a human, and even of the people who do, it's intended to imply that all species lives are important, that the mosquito's life is seen as equally valuable to the human's. The only reason such a proposition seems abhorrent to you is because you're looking at the mosquito through the lens of your carnist supremacist mindset, which is to see the mosquito as something worthless and thus conclude that a human's life is considered by vegans to be equally worthless.

But again, like everyone else vegans take anti-speciesism only as far as is practical. We just do it better. The mosquito bite is easy. If you know mosquitos are around, it's wise to wear repellent, and take other appropriate precautions depending on your circumstances. Maybe modify your environment if possible to be less of a breeding ground for them, if it's bad enough. If you're dealing with a particular mosquito, odds are they have already bitten you, so how is the lethal carnist reaction any more protective against a disease that may have already been transmitted, than simply blowing on the mosquito to get them to fly away?

Locust infestations happen because of shitty agricultural practices. If you've got a plot of land that's full of nothing but copies of one tantalizing crop, then of course it's going to be an obvious buffet for a vast amount of insects. Are veganic farming or veganic permaculture methods extreme? Or is it more extreme that our most common monocultural methods of farming are causing so much pollution that it's bringing so many vital pollinators to the brink of extinction?

You make the same erroneous argument that many other carnists make, which is the idea that because vegan values can't always be practiced perfectly, that somehow automatically means the entire ethical framework is without merit. But that's obviously nonsensical. To the individual mosquito or mouse, it makes all the difference in their entire little lives, whether they incidentally pestered a vegan or carnist. It's been estimated that a single vegan living their values results in about 200 fewer livestock animals being slaughtered every year. Is it extreme to live in a way that would end factory farms forever if we all embraced it, or what about the lifestyle that created them in the first place?

Nearly every half-baked gotcha that carnists try to catch vegans in has a common-sense practical answer. The example of predation in wild areas is a point of contention in vegan communities, whether we should intervene or not and ultimately make rather significant changes to the natural world, but presently it doesn't really matter, because there are so many other obvious abuses that need to end.

Veganism only looks extreme from the deluded perspective of carnism. But in reality going vegan is like becoming sober, and recognizing how disturbing it was to live the way that so many continue to.