Judges at least in the USA can alter the law, in two ways:
1. They can determine the law does not apply
2. They can decide the law collides with another, higher ranking law and so does not apply
Both don't really do anything unless the other judges start to agree with them, in which case people stop bringing the cases because they know they'll lose.
The cost of fighting the case is almost always way more than the value of the case, so they'll avoid fighting it if the outcome is pretty well determined. This is one case where you have an advantage; you can defend yourself pro se (and likely lose) but the very cost of attacking your pro se defense is often way more than the value they get from you.
1. They can determine the law does not apply
2. They can decide the law collides with another, higher ranking law and so does not apply
Both don't really do anything unless the other judges start to agree with them, in which case people stop bringing the cases because they know they'll lose.
The cost of fighting the case is almost always way more than the value of the case, so they'll avoid fighting it if the outcome is pretty well determined. This is one case where you have an advantage; you can defend yourself pro se (and likely lose) but the very cost of attacking your pro se defense is often way more than the value they get from you.