I usually dont..its a life.. meh.. i have respect ( different levels of respect ) for all forms of life, when a bug is really annoying me i ask someone else to kill it or if its in the floor i kill it the fastest way possible so it doesnt suffer, i kill few bugs also because i fear most of them, the only exception are the ants which i think are cute and ive already eaten a ant once ( it doesnt have taste ).
I usually kill mosquitos indirectly, i mean i use a Raid product which has a fan that puts something in the air and i see raining mosquitos
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EDIT: If mosquitos didnt exist we would be in trouble.. EVERY single forking animal exists for a reason, flies really suck as adults but when they are "babies" ( i dont remember the name in english ) they eat shit and dead bodies, they clean the shit out of our world, they are way cleaner than us.
EDIT2: LoL at Vazza.
I am rfeally afraid of spiders as well, i dont petrify, i run away just as i do with bees, vasps, butterflies, cockeroches and all the other generic insects.