In this thread, solve the fermi-paradox through whatever excuses you can think of. Feel free to use realistic or space opera logic reasoning. And feel free to debate anyone's solutions.

Here's my solutions:

-The universe is extremely huge [just play space engine and you'll see], intelligent life is extremely rare [may need to comb a galaxy or two to find ET], not that long lived in cosmic scales and FTL doesn't exist. Probably the best possibility since it means no aliens that will wipe us out, just a bunch of alien wild life to dick around with if we can get interstellar.

-Who says a alien race didn't already take over the galaxy? With dominance of the milky way or at least the part we live in they were able to actually make a uniform system consistent all over that demands that no action towards planet bound civs [be it malicious or benevolent] are taken until they find one of their outposts or sentinels they tend to place in the outer parts of a star system in a obscure place. They may perceive time much different from us. 

-There's multiple civs in the galaxy, but they're spread out pretty sporadically [in that only one in like, ten million star systems ever gives birth to a intelligent civilization, and only one in a thousand of those has a currently space faring one] and rarely actually do the "colonize a billion worlds" thing instead preferring to select a some worlds best suited to colonize [kinda like what humans probably will do] or just being nomads or never actually leave their star system. This gets complicated by other life generally having different ideas of habitable. Why would they want earth? That planet has acidic liquids and is too close to the sun! Therefore the only way humans could intersect with them is if a star system had both worlds suited for humans and world suited for planet X folk. And there's not any intelligent life nearby that likes titan-likes or Europa-type worlds.

Even the few that do never take the whole galaxy due to inertia and colonizing ships going in directions where worlds already were colonized causing lots of internal warfare that retards their progress. This gets worse as resources in the inner colonies get used up.

-A giant space monster ate them all.