We published a statement on our stance on neutrality of free software (and why we won't stay neutral in this case): https://f-droid.org/en/2019/07/16/statement.html
You seem to believe that Gab is wholly composed of harassers. This is simply false.
The majority of Gab users are nothing like that. AND harassers exist on every platform.
Singling out Gab like this is silly.
The reason Gab has been seized upon is because it's popular with Trump supporters, and a lot of Trump opponents are desperate to do anything they can to prevent Trump 2020.
That's the issue that I see with free speech. To clarify, "free speech" as an ideology is different than "free speech" as a right.
Words are able to harm and kill people by directly amplifying hate in people, who then commit actual hate crimes. There are examples of exactly that happening. [>>]
"Free speech" as a law takes that into account, where "free speech" as an ideology completely ignores that relationship in favor of "I can say whatever I want and it will have no consequences".
The consequences are there in the open to see - and, for some reason, they are not seen by the proponents of absolute free speech as an ideology.