You are choosing to read in a sin that is not there. You are doing this probably because you were taught the easy thing, they were not preaching and witnessing hard enough.
The truth is much harder however. It is easier to be religious under oppression than it is under assimilation. In the churches where there was the threat of anhialation everyone hunkered down and shared, and bled together, and became unified. Where there was no such threat sin crept in, or worse (Laodicea).
There was no overt sin in Laodicea. There was only the threat of assimilation. There was nothing to bind them. They felt blessed. They felt the reason for their blessings is that they were doing OK. The problem with this is the problem of the rich young ruler.