A more likely scenario is that there are an uncountable number of very old, very intelligent, alien races out there and we haven't got the intelligence/means to even start detecting them. As for them contacting us or making them selves known to us we're probably not remotely interesting to them.
One or more of races probably came by at some point in our history and decided that either the trilobites, the dinosaurs or, if they came by more recently, the almost intelligent, selfish, greedy warlike "ape things" have got a l-o-n-g way to go before they've evolved to the point they are worth a closer look.
I'll have cycled past at least one nest of ants this morning (probably 100s). If I stopped to have a look at one I'd find it interesting to see what they were doing (I like ants) but I doubt that they would have noticed me and I certainly don't think they would comprehend me or my bicycle.
The idea that humans are either unique, the only sentient life in the universe or important (in universal terms) is simply delusional arrogance by minds too small to even begin to comprehend the sheer vastness of it all.
Intelligent life is everywhere in the universe - apart from where politicians gather !