I kind of get why teams like Williams and McLaren would object, after all they operate within their budget even if it is to the detriment of the team (as you could suggest with Williams and their pair of pay drivers). That said, I feel sorry for Force India as I get the feeling that some kind of financial mischief has gone on beyond the team that has led to their situation. I would rather not see them disappear but I do get why other teams object, otherwise what is to stop them going into the red to over-perform, say sorry that they cannot clear their debts, go into administration and then keep their prize money.
It's the rock and a hard place situation. I really hope it is sorted as although Force India are kind of Williams main opposition (well, not this year), I really do respect them.
Williams and McLaren also get extra money for being old teams - even Williams' £10 m bonus CCB payment would have covered the £4 m initially cited in the administration document.
Also, it's not clear that either team does keep a 100% within-budget system. It's just that because both have much bigger budgets in the first place, an overspill of a set amount is less of an issue for them because they have more leverage to quietly sort it out without resorting to administration and the like.
Williams does at least have its share system to stop it going too far into the red, but McLaren really doesn't have anything to prevent its getting completely indebted. Also remember that Mercedes went $74 m over-budget last year, so complete indebtedness is happening all through the field. The difference is that Mercedes' debts are to internal debtors in other parts of the team, so the board will cover it (I believe McLaren has a similar situation to a rather lower extent). Williams (mostly) and Force India (entirely) don't have those options as they are mostly/wholly the F1 team.
Williams can't afford to not object as its own liquidity is in danger if the Strolls move their money. McLaren is objecting because it expects to be beating Force India and even now, often isn't. Plus McLaren worries about Mercedes having too much influence over too many rivals (there is some proxy fighting going on between engine manufacturers).
I'm expecting Kubica at Williams, unless he's outbid, and that gladdens my heart because Williams deserves an actual, proper racing driver (for all my gratitude to the Strolls, I have trouble calling Lance a proper racing driver so much as a "Professional F1 Driver" who goes through the actions required of a racing driver but doesn't really race
. And Sirotkin has not shown himself to be an improvement over Stroll).
I expect that Perez will be the other driver, in gratitude for his help in ensuring there was a team for Stroll to race at. What this means for Ocon is difficult to read at this juncture.