I am quite certain that I am being downvoted because there are people who no longer care about the quality of arguments and think that a poor argument in support of their cause is a good thing.

The bulk of downvotes I have received fall into two categories. One is from people who disagree with me, and the other is from people who believe that my critique of a bad argument means that I believe the opposite to the conclusion of the argument.

The latter is the one that bugs me more. Because I feel that a bad argument in support of a conclusion that I believe is damaging to the understanding of the conclusion because it represents a refuge that anyone arguing the opposite can cling to in order to undermine good arguments. They can legitimately ask "Why should I believe your good argument, if you express a similar degree of support for an obviously flawed argument" It signals that the position is held because of allegiance, not because it is correct.

Even scarier is that it raises the spectre of people passionately advocating for a position when they themselves do not respect the opinion, but simply acknowledge that this is the position of their allegiance.

There is experimental evidence for this on both sides of American politics with people being tested flipping their opinions on identical policies just by presenting them as being the favoured opinion of a different side.