Because when you simply accept the world as is, it looks a lot like you're endorsing the status quoIt looks that way only to a particular subsection of society (leftists). Given your staunch defence of unions the other day I guess that's very much consistent with your expressed outlook here.
For conservatives accepting the world as it is doesn't automatically imply endorsement or support for the status quo. It only means you accept that the world is big, you are small, and for almost all problems on a social scale there's either nothing you can do or - just as likely - any attempt to fix it via social engineering will make things worse rather than better.
This is because they view most social problems as inherent to human nature and human nature as essentially fixed. If you can't change human nature then many apparent social ills are unfixable, and indeed can't even really be described as problems to begin with, no more than people's inability to fly by flapping their arms is a "problem".
To leftists this conservative acceptance often looks like coldness, lack of compassion or outright support for the existence of problems, a view which unfortunately can often then be used to justify nastiness, no platforming, aggression or even violence against them. But it's not any of those things. It's just acceptance.