Because die hard proponents are so blind.
It goes like this:
- Hubbard makes outlandish claims of Scientology’s perfection, infallibility and being the Only True Path.
- Someone counters the claims by finding errors in the work
- Hubbard and the church goes defensive by attacking
- The critic tries to enforce the criticism
As long as there are proponents of Scientology that refuses to see its obvious faults, there will be vehement critics.
If Scientologists would instead openly admit faults in Scientology, the polarization would subside and more constructive discussions on the subject may ensue.
There is less polarization where there is more chill. Witness Islam vs. Buddhism.