If you zoom-out on the channel, there is a lateral light almost 4-miles east of the jetty. A long way out, but it is the charted, prudent channel established for deep draft vessels. If the Searay went inside (west of) the 5/6 buoys, definitely a risky move. Note, these are flashing 1-second lights and would be especially difficult to miss at night unless obscured by weather (which is why they are 1-second lights).
This is a major channel. In my opinion, under reasonably calm conditions, I would enter this at night without prior experience. Never a preference, and the destination berth may not be tenable at night/first-time, but this channel entrance is well marked and adequately sized. With radar/AIS, it is definitely manageable. I would not go 4-nms out to the Q Approach Light, but heading to the #3/#4 set of lights (4-secs) is just over 1/2nm east of the jetties.
As others have said, the facts are not clear and likely won't be. If pushed to guess, the Searay tried cutting the corner between the #5/#6 buoys and the jetties. I understand the temptation, but it would take less than 10-mins round trip to get to the #3/#4 buoys 0.5 nm east and line-up properly on the entrance channel.
Charts are amazing pieces of documentation. I am not going to diss the helmsman of the Searay, but will use the experience to reinforce a sense of prudence. Depending on your style of boating, simply saying "never enter a new channel at night" may not be realistic - for experienced mariners, many channels are reasonably safe at night under calm conditions. There are other channels which I wouldn't enter under perfect conditions (Depot Bay OR being one). The entrance into Lopez Island that Sunchaser cites is one that would give me serious pause without following a local.
There are always learning experiences in mishaps, but are often nuanced. Jumping to extreme conclusions is only partially helpful. Saying "Never enter a channel at night" is a perfectly safe rule, but does nothing to prepare you for the time when you are faced with a tough choice. There are sometimes ways to make it safer.
Peter