Unlike Leo Mckinstry I do not think Bamber's supporters are 'creepy'.
However there is a thing called 'self denial'. People get lost that way. Refusing to accept they are going the wrong way and turning back. I got lost in Tenerife once doing that.
After decades of supporting Jeremy, his remaining supporters are refusing to change stance. Justifying, making excuses for or not accepting the mountain of forensic and circumstantial evidence. Or the motive, opportunity and no alibi. Preferring to support the triple alibi theory Jeremy is always bringing up.