Historically, GOP candidates have benefited from lower voter turnout (Trump ‘24 being the only notable exception in 40+ years).
By disincentivising Dems and Independents from voting because “both sides bad” and “nothing gets better” it’s increasing the chances of a Republican victory, and accelerating your nations decline.
Your primaries are the period you’re meant to vote for your preferred candidate, whereas in the general election you vote against the candidate you hate more.