For Roswell incident to be a real ET, as I justed posted, it could be 1,100,000,000,000,0........ chance of it is real.
Any drawing of ET is more like human imaginary picture. Why ET cannot be like Doreamon?

He also got big eye, big head as well.
To be ET as like as human body structure (most ET drawn picture has a pair of leg and had, as same as human except bigger eye and brain), it will be another 1,000,000,000,000.... chance. Even in earth, we have various form of living creature, from no leg, 2 legs, 4 legs, 6 legs, 8 legs, multiple leg creature around or even fish type. Earth is so small already got so many variation, sometimes I find hard to believe ET is as same body structure as human kind. Bare in mind, human kind structure is not the best or in fact worst than most creature naturally in term of surviving the environment.
So with just 2 simple fact, we have 1/1,000,000,000,.... x 1/1,000,000,000,..... chance of the ET is real in the incident.
I am not saying there is no ET, I 90% believe, there would be living form elsewhere, but to contacted with earth, reached earth and as same as human body structure is something not easy to believe.
Possibly by the time we come in contact(a radio signal) with another civilisation, they could already be extinct. A last message from a dead civilisation.