If you pick up a history book from whatever period you will find: murders, massacres, atrocities, assassinations, conspiracies, plots, coups and countless crimes. Furthermore you will find wars and the tactics and strategy for waging wars, and perhaps the most important key to the art of war is deception. If you take these aspects out of the book, you don't have a book. All that's left is a pamphlet on agricultural methods. Personally, I am interested in history, including the history that is being made now, and I'm curious to look deeper into matters than the colouring-in book level of the BBC.
I have heard that conspiracy theories are wrong because they undermine trust in the government, and faith in the system. I wonder; is this a general criticism? Does it apply equally, whether you're living in the Congo, or North Korea? The likely retort to that would be 'of course we're not as bad as North Korea'. Indeed not, thankfully, but does this mean our own government doesn't do bad things and then lie about them and cover them up? Does it mean, until such a time as the state crosses some demarcation-free border into overt tyranny, we are duty-bound to support their official version of history? The Official Secrets Act enables them to lock up documents for as long as 100 years, if they deem them 'sensitive'. Thus there are still many things from the First World War that ornery folk are not allowed to know. So if they are not prepared to tell us the truth about WW1, why would we expect them to do the same for the Iraq War or the Libyan War?
Taking these things into account, it is how you react to them which will determine whether you will be called a conspiracy theorist. If you are happy with the superficial version of events handed down from the official organs of state and establishment media, then fine. If, however you are interested to know more, then you must go further, and will certainly stray over the boundary into the badlands of conspiracy. This will open you up to a range of ad hominem attacks against your sanity, reason and intent, but it would be a poor specimen of a free man who let that influence him.