What I'm going to say may sound senseless, but I'd like to know why my point of view has been ruled out. I saw some videos where a person points a laser through a slit, then as he/she reduces the width of the slit what should be a single point(the point where the laser hits the surface) becomes this:  

I thought, well, maybe as the slit is closed the passage becomes sort of congested by photons and they bounce on each other and on the slit(because it has a thickness), producing the pattern that we see in the image. I'd be glad to know why this possibility has been ruled out.

I saw some videos where a person points a laser through a slit. As they reduce the width of the slit, the diffracted image spreads out, like this: 

Can this pattern be viewed as a consequence of Heisenberg's uncertainty principle, applied to photons?