Why do some teams take the knee and some don't?

In football, Over the past year or two, you must have noticed players taking the knee just before kickoff in football games. And you also probably already know they do that in support of the fight against racism and discrimination.
Of course, the English players took a knee before all of their games including the final in Wembley. Wales also did; Belgium, too.

But the rest of the national teams either did not take a knee at all throughout the tournament or did in only a few games.
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Understand the reason behind it, we know it is for racism, but do the teams that don't kneel don't know about racism?
Zaha had his own reason for doing it too. Enjoy our video.
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Видео Why do some teams take the knee and some don't? канала Goal 90