I think this is good advice, not only because it generalizes the problem, but also because it avoids the politicization of the topic re: Cambridge. This shouldn't be viewed as a left vs. right problem.
It might be beneficial to engage in such fiction, seeing how unable the right is to even pretend to put country above self-interest with regards to election hacking.
But let’s not pretend that this fiction is true. Only one campaign hired this company. And if they are bragging to journalists now that they are willing to entrap politicians with hired prostitutes, I’m fairly certain they would have had some things in their sales pitch two years ago that would raise red flags in an ethical campaign.
The people you hire are a reflection of your character. And if they end up arrested one after another, it becomes less and less likely to just be bad luck.