CA:
1. Giving tochacha is a halachic obligation.
2. In any event, we’re not even talking about giving tochacha to individuals; here we’re talking about crying out against a widespread public trampling of halacha, that’s not only an individual aveira but rather an aveira that the meizid baalas aveiras causes masses of otherwise non-sinners to become sinners b’shogeg (at the least). Among many other aveiras here we’re dealing with machshil es horabim, לפני עור, etc.
We do speak in general terms about how the Reform and Conservatives are very wrong. All the more so we should speak out and decry against the type of sinners this thread is discussing.