I agree doggiediva. One can get extremely angry and want to break every dish in the house or go and beat someone up. But that isn't acceptable.
We can be extremely under stress to almost the breaking point, but that doesn't excuse us so we can go spend all our money on gambling, drinking or drugs.
There are consequences for bad/wrong choices.
The BS did not force the WS to make a choice to have the affair.
The following is not a religious statement per se, but should for the purpose of the discussion be taken in a historical context:
The Ten Commandments were a set of rules for a society and most of our laws are based on them. Most cultures around the world follow the same basic rules/laws. They are very old rules and very basic: no murder/killing, no stealing, no lying, NO ADULTERY.
The WS did something wrong and must own up to that. Yes, they may blame circumstances and give reasons, (and in way too many cases blameshift the cause on the BS) but it is still a wrong choice that has a lot of consequences.