I've had a quick read into this, and the words "must" and "will" are a problem, because all I can see is that it's been rumoured, and it's not off the table, but that the Mirror and Express are running with it. It isn't a done deal, they may yet discuss it and decide against it.
Again, I don't actually disagree with you. They probably shouldn't be made to express an opinion. I would ask them to stay away if they'd come out in support or Putin, and I'd make sure they played under a 'neutral' flag instead of a Russian one even if they condemn him publicly.
Still, I can't really bring myself to get properly mad about a handful of professional tennis players not being able to compete at Wimbledon for (what's hopefully only) one year, especially when it's only hypothetical at this point too. It goes back to my original point that I think this is a valid discussion to have, but as soon as I start thinking about whether that's unfair on those tennis players, all I can then think as a follow-up is to look at the big picture and consider how unfair the war is on all of the ordinary Ukrainians having their homes destroyed and all of the ordinary Russian foot soldiers being sent to their deaths. I just really can't get that angry about a few sportspeople being unable to compete in a few competitions in the grand scheme of things, so it confuses me to see others who seem to be more visibly angry about that than they are about the war itself.