Crash sites

I am quite concerned with the recent crashes which involved Boeing aircrafts. I am not sure why but I guess it is because they have sold more airplanes than Airbus so the ratio of planes get problems will be much higher. Having said that, I have noticed that in the two recent crashes which one involved a Spaiair and yesterday, a a Boeing 737-200 bound for Theran, had their serviced done recently before they crashed. Hum... This is rather strange because there should not be any problems after servicing, right? I hope that there will be investigations as we need to know the truth.