Both US Republicans and Democrats are successfully selling to their constituents that the other party is guilty of egregious gerrymandering, so those constituents will support aggressive redistricting efforts to "even things out".

I think the average member of either party generally understands gerrymandering to be bad, but with an redistricting arms race escalating nobody wants to be left behind.

I think gerrymandering generally is abhorrent and anti democratic. At this point we need a new, more fair redistricting aggressively enforced from the top down to change course, and I'm not sure how we can get that through when it would likely take a 2/3rds majority in congress to pass... but significant members of congress benefit from gerrymandering and would lose their position in the next cycle if it were taken away, so they are unlikely to support the measure.