a lot of people dont, but i dont see how they carn't, heres my logic...
an extraterestrial dosen't have to be a little grey man in a flying saucer, any type of life atall would qualify, even microbes, bacteria from another planet would be an extraterestrial lifefrom, and how many planets have we searched? we live on earth, swarming with life in every single corner of the globe, the moon is not a planet, and the only other planet we have searched is mars... we found evidence of life, fossilised microbes have been found on mars. debatable but a lot of evidence, and a lot of scientific opinion towards fact. there is also conclusive evidence that there was once water in mars, this would be brilliant for any possible life.
now, if earth has life, and the closet planet to earth, the only plant we have searched for life, had once had life, even only as microbes, and there are billions upon billions of other planets that we havent even come close to, are you seriousely telling me none of them have life on them?
whether there is planets with life equel or greater than us, i dont know, but its not unlikly, we managed it, that proves its not impossible, we havent even got anywere near to the edge of our soalor system, so if there is life in other solorsystems that is equel to us, we wouldnt be able to know of each other, and remeber, space has been there for countless millenia before us, anything could be out there.
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