What you are saying is that the ICJ can only make the situation worse, since to you it cannot convict properly nor acquit properly. You won't regard its results as just. It doesn't change that only Israel, out of all the countries with much worse records, is accused.
I'm not saying that I necessarily won't regard its results as just; I'm saying that its rulings are prone to being biased and politicized, so it wouldn't be the ultimate arbiter of the facts regarding this issue.
Multiple countries have been ruled against by the ICJ in high-profile cases over the years, but in this specific case, South Africa chose to litigate against Israel rather than multiple countries. I don't see this as a unique or strange situation considering that the alternatives—either litigating against all countries that South Africa finds guilty of abuse or not litigating against any country at all—don't seem to me realistic to expect of any country.
Speaking to that specific example I'm not sure that I'm getting your point: I'd be happy if the USA were charged in such a court and convicted and barred by international law from entering into further confrontations. I know that there would be a lot of pain here as a result, but it would be better in the long run. We could shrink our military, pull back. We might escape Rome's ancient troubles (of soldiers and generals eventually replacing the government). If Egypt were committed to provide soldiers around the world for unknown future engagements over the next century would you want to get out of those commitments? I think you would, too.
I think global military commitments should be weighed on their own merits, not through a blanket rule. For example, I think it makes perfect sense for small and militarily weak countries like Estonia, Latvia, and Lithuania to seek protection from potential Russian aggression by joining NATO, in which case a defensive alliance between them and the US makes sense. On the other hand, I don't think it's justifiable for any of them to aid the US in unnecessarily invading another country, like some allies of the US did against Afghanistan and Iraq.
My point was that South Africa, or any other country, can't realistically be expected to simultaneously put forth charges against multiple countries in the ICJ, so I don't see its focusing of its current case on one country (Israel) as an anomaly or something that should count against the case, as I believe the case should also be evaluated on its own merits.
Putting that aside I will try to understand what you mean. I did not know that only one country could be charged at a time, but I see it as problematic if, as you say, the ICJ favors the West. Under that condition the ICJ gains prestige if it convicts, since Israel represents the West. I don't like all of these wheels within wheels.
I don't know whether only one country could be charged at a time either, but even if more could be, I think geopolitical and economic concerns could prevent a country from charging multiple others at the same time.
There are historical examples that lead me to believe that the ICJ could have a Western bias, but whether this applies to the current judges is a different question. Either way, though, the ICJ is largely toothless because it also has no power to enforce its decisions.
I am sorry for not knowing the history to which you refer in South Africa or in what way the USA, relative to other nations, did not stand against apartheid in South Africa. Were we the last to stand against it? I don't know the history, but I'm hastily looking around on the internet. We imposed some kind of sanctions on South Africa's apartheid government in 1986. Reagan (considered now to be very corrupt relative to other presidents) was thought to be a very good man while he was in office, and he didn't withdraw his embassy and didn't end our trade with South Africa. Keep in mind that USA had its own segregation right up until 1964, so even our action in 1986 was somewhat ironic and probably felt (though I wouldn't be alive for ten years) hypocritical. Only 22 years had passed.
@Samael_Khan answered this in post #68, and he's a lot more familiar with South African history than I am. The only thing I want to add to that is that if South Africa relied on support from Thatcher and Reagan to end apartheid, that system would have probably lasted for even longer than it did