You really think 99% of Russians don't want the war?
Russia state media feed their country lies and propaganda.
Many see through it, but a significant percentage do believe it/don't question it, many older people.
That's the context for any decision made. Loosing a job seems pretty mild in comparison.
Every single thing that can be done to heighten awareness of this within Russia, in my opinion needs to be done.
Balancing act. How to apply max pressure without going too far.
What has a Russian national with no ties to the Russian government or foreign policy, done that he should be sacked? What has a Russian footballer ever done to be kicked out of the World Cup/European Cup? All that's happened is you have robbed someone of his livelihood because of where he's from, not stopped Putin's war.
I've been to both countries, I've extensive contacts in both countries, I can read their alphabet, I've seen how they live their lives. The overwhelming majority of Russians don't want war, they just want what everyone else wants, the right to live a decent life in peace. Most of the soldiers sent to Ukraine didn't even get the choice. A lot of Russians have blood and cultural links to Ukraine and Ukrainians, so the conflict is akin to attacking their brothers and sisters. Unlike the Ukrainians, the Russians don't have an outlet, they can't speak out or protest as they know the consequences for doing so. That doesn't mean they support what's going on, and it shouldn't be seen as that. They're the silent victims of all this, they're getting hit far worse than the people who need to be and should be hit.
There are people to go after in this. Putin, Lavrov, United Russia, the generals, the military, the ambassadors, the oligarchs, their allies and their assets. Not the ordinary housewife in Novosibirsk, or the athlete who through no fault of his own, is a native of Omsk rather than Oxford. All those sanctions are being spun as a war against the Russian people, and it's going to take years to repair trust and relations with them after the war is over, in whatever way it ends.
The applause is just ticking a box, like taking the knee or the handshake. The reality is that many places in Ukraine have no power or internet atm, so they can't see any gestures at games and in any case, they have bigger things to worry about right now. I'm sure they would also rather more practical assistance in their struggle to come from their allies, than a round of applause.