Do you think these things would be happening no matter who was in power?

Yes they would be, but in different ways. Democrats always set the stage for Republicans to commit crimes against the working class. Trump put kids in cages built by Democrats. Trump militarized ICE and deportations after Democrats increased their funding to their highest levels with the largest increase of detention center construction. Liberals were outraged when they found Trump was denying due process to those he deported while ignoring Obama did the same thing with upwards of 75% of those he deported denied using a law signed into law by Bill Clinton.

And the Democrat ratchet effect prevents anything started by Republicans from ever slipping back.

Push the party left in primaries and local elections

This is another failed strategy that's never worked, after electing them they have no obligation to fulfill their promises, all they need to do is create another manufactured crisis before the elections that require everyone to come together and defeat their imaginary foe, 'the most important election of our lifetime.'

Calling out Dems when they do bad holds no weight when they know you will come back afterwards and reward their bad behavior with reelection.