THEN it says that passive or merely material presence may be tolerated (then again it may not) for a grave reason.
Who are you, schismatic cult-like Pharisaical Anonymous Coward and why don't you have the fortitude to reveal yourself?
You need some lessons in reading comprehension, as the "grave reason" qualifier does not apply to the listed circuмstances. Pay attention now (as if you were in second grade learning to read) to where the commas are.
§ 2. Passive or merely material presence can be tolerated
1) for the sake of honour or civil office,
2) for grave reason approved by the Bishop in case of doubt,
3) at the funerals, weddings, and similar solemnities of non-Catholics,
... provided danger of perversion and scandal is absent.
Funerals, Weddings, and similar solemnities are called out by the law explicitly, provided there's no danger of perversion and scandal (which there isn't). Outside of funerals, weddings, and similar, or situations where some public official is being honored, some grave reason approved by the bishop (in cases of doubt) is necessary. In other words, you can't just show up at an Orthodox Liturgy or Lutheran Sunday service for no particular reason. If there were some ceremony for, say installing a civil official, or in the cases of funerals and weddings ... it's well understood that people attend for the civil aspect, or in the cases of funerals, weddings, etc. ... the social aspect, and no one is going to construe a passive attendance as showing up to engage in the religious rites themselves. Now, if you were, say, a Doctoral student studying Liturgy, and just wanted to attend non-Catholic services just to study them academically, etc., that isn't enumerated here and would require permission from the Bishop, which would probably give to those would not likely be persuaded by the ceremonies.
This is the accurate translation of the Latin as well.
§2. Tolerari potest praesentia passiva seu mere materialis, civilis officii vel
honoris causa, ob gravem rationem ab Episcopo in casu dubii probandam, in
acatholicorum funeribus, nuptiis similibusque sollemniis, dummodo perversionis et
scandali periculum absit.