Not everyone thinks they are horrible, and for the many that do they are relying on the media saying that they played a part in the Capitol riots. I haven't actually seen any data showing what was posted on Parler or what evidence was used to justify shutting them down.

Don't forget...just because everyone thinks something is good, doesn't mean that everyone isn't wrong. Hitler was Time magazine's man of the year...less than a year before he started WW2.