I think that there is a non-negligible chance that I personally would follow the tax laws. (Although it seems very likely that at some point in time I would choose not to, it seems plausible to me that I might for some significant amount of time opt to follow the non-enforced laws, possibly even most of it (provided that the government was still stable and such) )

Not that I inherently oppose the use of violence to ensure that certain things that society has agreed on are enforced, Just that in many cases, I believe I would follow a current law set by a government even if there was no chance of punishment by the government (other than perhaps a public record)

(This is not to say that this is true of the majority of a given population, just that I believe that it is probably true about some people because I think it is probably true about me. (though I of course could be wrong in how I model myself) )

Note that I am claiming that there exist laws that I would follow without enforcement, but would not follow if they were not laws, but I am /not/ claiming that, for all laws, whether or not I follow said law is not affected by whether it is enforced.