Law

Should the government regulate hateful Billboards? I once saw a billboard that said the pope is the anti-Christ. I shrugged it off as a matter of free speech. But then someone pointed out that someone could advertise a billboard that expressed hatred for blacks. For whatever reason this has never happened. Most billboard owners dont want to accused of racism. So arguably society polices itself well enough without government intervention. Yet I suspect that there is another factor which is that billboards are owned by a very small amount of people because the high expense involved and the limited number of billboards. These folks don't want any bad attention. The same observation could be made about all aspects of the media. It is very difficult to get controversial or even outright racist materials despite the fact that many people are racist. (I suppose The Bell Curve is a notable exception) It seems like one "benefit" of concentrated wealth is that it promulgates political correctness to protect its...

This is a good question to raise. Unfortunately, Ian Kidd has implicitly offered us a false dilemma on the matter by suggesting that 'free speech' means either "anything goes" OR "we can limit free speech to those views [we judge to be] worth hearing/worth taking seriously." There are many possible positions in between this false dichotomy. I myself am fairly comfortable with the USA Supreme Court's current view which is roughly that "speech that is not dangerous in an immediate physical way is broadly protected." Examples of unprotected speech include things like shouting "Fire!" in a crowded theater, incitement to immediate riotous violence, joking about 'bombs' at the airport, and things of this nature. Slander and libel are also unprotected under civil rather than criminal law (you can't say things that are damaging to people that you know to be untrue if you don't want them to sue you). The problem with the standard suggested by Kidd: that we censor views we don't think are 'worth hearing...
Law

Is there a genuine case to be made for outlawing marijuana given the fact that alcohol and tobacco are legal? In other words, is there a way to make a distinction between marijuana on the one hand and alcohol/tobacco on the other hand such that it will appear legally justifiable to outlaw the one and not the other?

Sure, such a case can be made. Let's suppose we view all three substances as detrimental to society. We can still argue that practically speaking once a substance has the very long history of legalization and has become entrenched into society the way alcohol and tobacco are (and marijuana is not) it is very difficult to simply outlaw it. Yet, we might take steps to discourage their use... for example, the USA has been quite successful in reducing the smoking rate through education campaigns and by adding excessive taxes on tobacco. All of this is perfectly consistent with saying we should not legitimize a third addictive detrimental substance like marijuana into society by legalizing it.

Is it okay to disobey a just law just because you disagree with it? For example, take under-age drinking of alcohol. In various parts of the world there is a general disagreement about when it is a right age to drink alcohol. In the United States, the drinking age is 21. Many choose to begin drinking at an earlier age because they feel they have a right to do so. What philosophical problems are there with disobeying a just law?

Of course, it isn't morally acceptable to disobey a law merely because you disagree with it (you seem to be confusing the concept of a 'law' with the concept of a 'suggestion'). Let's suppose I'm an American driving in Europe and I want to drive on the right side of the street simply because I prefer it and find the government's insistence that I drive on the left side to be unintuitive and intrusive. This would likely result in someone getting hurt... most likely me. Laws like this one are designed to promote public order and protect people. I think the drinking age is a good example of this pattern (that laws we disagree with are often there to protect us and promote public order). The drinking age was raised to 21 in the USA largely to cut down on drunk driving accidents and injuries. And (statistically speaking) it has worked rather well. I admit that laws like this one do hinder the liberty of more responsible young adults for the sake of the 'greater good,' but it is hard to argue with...