Well, yes i do think that there is life on other planets because science says that it is possible. Scientists have already stated that there are other Earth-like planets in the universe, even if those types of planets are rare, the chance of there being more of them is sufficient.
Somewhere out there, whether they look like us or not, whether there is only one blueprint for life which is the Earth-type life, i.e. humans, reptiles, mammals, fish etc or they are some other type that truly are alien to us, I believe they are out there.
I don't really believe in all these conspiracies though, if aliens were here or have been here we would have some concrete evidence. Instead, we have sightings, stories and so called coverup conspiracies which I believe are only due to human nature.
I also believe that if a race is technologically advanced enough to travel vast distances across the universe and make contact with other races, then they won't be the war-like aliens we see on T.V.
In order to become sufficiently advanced and organized enough to begin space exploration with real intent, the race probably had to advance beyond the war-like, primitive, power-mongering stage and become much more unified and peaceful.
I believe one of the main reasons we haven't gotten deep into space is because we are still in the war-like, competitive, power hungry stage. Once we pass through that stage, which may happen when we experience a massive cataclysmic disaster that brings us together, we'll become a unified and technologically advanced race. Instead of hiding technology and trying to be better than other countries, races etc, we'll be sharing one technology and combining the brains of every race.