I think the rush to judgement about things we don't understand is harsh. What I do know is that Lazar blew the whistle on Area 51 and S4 in the 1980's, DECADES before our government came clean on it, finally admitting its existence in 2013. He also knew about Papoose Lake being the area to watch, not Groom Lake, which only someone working the project would have known. Lazar also gave the color and properties of element 115, ununpentium, many years prior to the Russian claim to it's discovery in 2003.
Unusual objects have been observed over planet earth since 1440 BC. Just because you are not among the 10,000 people worldwide who spotted an unknown craft defying the known "laws" of physics in the past eight months doesn't mean Robert Lazar wasn't hired, as a scientist, to reverse-engineer some of the downed extraterrestrial vehicles our governments have confiscated and hidden over the past seventy-plus years.
Do you HONESTLY believe our government is incapable of erasing someone, especially a hermit-like scientist, from MIT? My own cousin was erased in 1969.