One could argue the right with its views on abortion and religion suffers the same problem, one they've largely tackled by voter disenfranchisement and gerrymandering.
The difference I think, is that the purity spiral on the left encompasses the entire party. If your perspectives are too moderate you are shunned from the entire hemisphere of politics and often suffer a barage of name calling (e.g. bigot) from your own 'side'.
On the right, this is far less often the case. The right is significantly more tolerant of people who fall outside of purity definitions. For example, the majority of republicans are pro-life, but co-exist with roughly a third of republicans who are pro-choice.
In contrast, most Democrats will not tolerate a pro-life member under any circumstance.
The party that chose Biden and Harris is in a purity spiral? They’re not exactly marxists…
And on the right it’s not the case? As soon as anyone disagrees with Trump they get steamrolled and labeled a traitor
You can be shunned from MAGA, while remaining republican. You can be shunned from the religious right, while remaining republican.
There is significantly more ideological diversity within the republican party than within the democratic party, and the result is democrats switching to republican at a rate 4 times higher than the republicans switch to democrats.
Can you really? Who is that?
This poll is a little old, but in 2023 only 38% of republicans identify as MAGA republicans
https://www.vanderbilt.edu/unity/2023/04/07/first-ever-vande...
And here's a list of prominent republicans who are not MAGA republicans:
https://en.wikipedia.org/wiki/List_of_Republicans_who_oppose...
So ... 4 senators and 2 representatives are not MAGA. Everyone else has had to swear fealty to Trump or leave. And you say that's diversity of opinion?
The list is not an exhaustive list of non-MAGA republicans, it is a list of non-MAGA republicans who publically opposed Trump's election even after he won the primary.
Non-MAGA republicans overall are about half the republican party.
The right is every bit as bad at this as the left because at the end of the day people are going to people.
Democrats for life of America disagrees with your assessment. The organization has existed since 1999. Henry Cuellar is a member of the democratic party and is very "pro-life".
The issue is that "pro-life" has morphed into anti-choice. What is happening in Texas and other states is not pro-life. Forcing women to die is not a pro-life stance.