That's a lot less true than the "all democrats want to defund the police". Where all democrats certainly didn't want to defund the police immediately post-George Floyd but there were a large amount of democrats that wouldn't publicly say that when prompted to.

On the other hand, you'll find plenty of Republicans today who would say that they think legal immigration is great.

The main point is neither of those were ever true and the situation with Democrats was largely caused by the outsized influence of vocal minorities, not of actual sentiment. Similarly, there are plenty of Republicans who think that the current actions of ICE are over the line but won't speak up.