If you believe in good faith that you have not broken the law, and can reasonably convince a jury of that, you almost certainly will receive a lighter sentence than you would have otherwise and in some cases also be acquitted.

So this isn’t really a good argument even if we ignore the fact that it’s a non sequitur.

A better argument is that the good faith exception, while making sense in principle, can easily be abused by the police to make illegally obtained evidence look like it was done in good faith, and therefore the exception itself should be removed because of how difficult it is to actually gauge and enforce.