Swatting a mosquito generally doesn’t induce suffering, if it’s done quickly. And since they are not social animals other mosquito probably won’t suffer from the loss.
This is like saying it is okay to kill a lonely person with no friends and family, as long as it is an instant death.
The point is about suffering.
I don’t agree with you that suffering is the single center concept to base your moral judgement on these issues. Not all living things that i care about are able to suffer, and I do not care about all living things that do suffer. I do not care that i cause a mosquito suffering by killing it (wounding it), if it is sucking my blood, or even just being annoying when flying around me, because I value my comfort above its existence (and suffering). I expect you do the same? This is speciesism.
That’s like saying people have a good reason to beat people who don’t look like them: racism.
Except we both agree that racism is wrong. We do not both agree that speciesism is wrong.