Cutting off illegal immigration solves a problem that doesn't affect me in any way whatsoever and replaces it with a problem that causes me to pay higher prices for everything and gives the government larger deficits to deal with, while also having a higher crime rate. Plus Obama deported more immigrants than Trump did, and the democrats just tried to pass a bill offering everything the republicans were asking for on immigration. The only difference between the parties on immigration is that the republicans want to be more cruel to people trying to enter. The democrats should try offering something better.
And I'm not sure what you mean by "fringe left agenda". If you're talking about something like student loan forgiveness, I'd agree that paying off loans and changing nothing about the system is a bad idea. If you're talking about woke culture bullshit, nobody in DC mentions or proposes bills dealing with any of that except for republicans.