If its the type tat appear in house and keep on flying around..
lol i no comments.. but for those that we see outside.. like eg
those just crawling around on the streets etc.. i will leave them
alone.. There was once my friend walk pass, and he purposely kick
the cockcroach. -_- I think its quite cruel, coz the cockcroach
never disturb him wat, purposely kill it -_-.
Well, I think we should TRY to be merciful to insects also lor,
they actually feel pain when we kill them and try to struggle to
live everyday. We are more much more fortunate than them.. insects
need to watch out for predators almost all day long, if not careful
kanna eaten. 
For us we dun have to worry bout
being eaten alive everyday and there are kopi-tiams everywhere
providing food for us readily. 
