There has been a lot of blather about who “caused” the shutdown, a different question as to whether it is worth it.
Actually, the analysis s very simple. When one party tries to change the status quo, and is willing to disrupt a larger system to obtain that end, that party is “causing” the crisis. Trump wants one change in the status quo, hos wall, and is willing to disrupt a big chunk of government. Even without his having taken ownership, to say that he is not the cause is simply ridiculous. If the Dems were to try to change immigration policy by a shutdown, they would be causing a shutdown. If they were using it to restore the prior status quo of a unilaterally changed policy, they would not.
Now whether it is “worth it,” depends on a balancing of harms, but there us a strong presumption against the legitimacy of using disruption to achieve narrow aims.