In Germany it depends on your colleagues but I think there is a fine line you should not cross: Telling others what to do.
So for example "you should not have a betting pool, look at what happened there, you should be boycotting it" will be taken very negatively. Telling others what they should do, will not be perceived well.
On the other side, what you personally do is your thing and communicating this is perfectly fine. "I'm sorry, I have read about everything that went down there and I have decided to not participate in this Weltmeisterschaft (World Cup), in any way." If you want, you can add a single link to a reputable news source, but if somebody does ntonot know about it by now in Germany, they have been living under a rock. For the last few years.
I would say that is a good general guideline here. Don't tell anybody else what they should do. Tell them what you will do and leave it to them what they make of it.