This is a grave and fundamental mistake. Its akin to an investment banker asking you to invest in the Malaysian stock market while he invest in the Singapore stock market. It goes down to credibility and integrity.
Firstly he does not need to go but he needs to concede that he committed a grave error and forward a sincere apology. WP CEC should step and express their feelings and make it clear that it treats such matters in the future as reasons for expulsion. At the moment, WP is taking a gamble as people are going to place less value on their words until tyhis is addressed.
Secondly, why do you consider Yaw as more capable than others. He does not strike me as such. He however does strike me as a good admin assistant. In the 1st instance he joined YPAP and he was fully conscious when JBJ was persecuted and the privy council, detention was in the works etc. He is an opportunist who knew that he would never be an MP under PAP.
Look at his article on Ho Juan Thai. Certainly strikes me as one who does not think sufficiently enough and lacks political maturity and common sense. Notice that Low did not comment on the issue. He probably would make a good ward counsellor but nothing more.
WP first had James Gomez who was politically astute but organisationally bad and now the opposite.
I think we have gone through the points before and I see where everyone was coming from. Maybe I share a different POV but the question is if having him retire from politics help in the cause because people like Harbans did alot worse other than not voting for PAP (or maybe he did and no one knew). My impression of WP is people needs to be a team player and every who had left it are now in limbo, whether more capable than YSL or not. The end result without team players is the opposition would continue to remain small.
But allow me to express another POV on the analogies you raised.
1. To me YSL seems like an investor who is not eligible for the Malaysian stock market.
2. I don't think he has been the only opposition candidate in the Singapore stock market but the rest were not as foolish to tell others.
3. Think you got one serious factual error. YSL has never been in the YPAP. If he had, an "overly honest" chap like him would have be open to sharing it. He was however a ex-member of the SPP, the party of Chiam and now in the SDA.
I also do not recall that he apologized but several articles revealed that he will never vote PAP again. I am not one who expects opposition candidates to apologize or I would have demanded that from alot more people, like CSJ, FS, SC and TLS etc. From my sense I also do not think the most sincere apology would please everyone commenting on this issue except at most yourself.