You need to ask 2 questions.
1) Did this eye witness say ANYTHING about planes (or are
the sub titles and reporters trying to put words in his mouth)
2) Why would this guy commit suicide?
"...the great masses of the people in the very bottom of their hearts tend to be corrupted rather than consciously and purposely evil...therefore, in view of the primitive simplicity of their minds they more easily fall a victim to a big lie than to a little one..."
- Adolph Hitler