Not all software patents are alike. Some of them actually demonstrate an original, complicated, novel, non-obvious technique, in sufficient fidelity that an engineer, looking at the patent filing can reproduce the secret design, with far less effort then it would take them to do so without the patent. That is an example of the patent providing benefit to society - that merits society providing it with legal protection.
I would argue that all software patents should include complete source code and build details necessary to compile a working version.
Something like MP3 or h265 represent nontrivial investments in information theory, and I'm basically okay with patents granting a (temporary) exclusive licensing period in exchange for sharing the practical code and theoretical work.
Patenting something like "one click ordering" or "facilitating inter-personal communication by sending audio over the internet" is just ridiculous.
