The fact that things could have been worse doesn't change the fact that the effect was absolutely devastating still. Thousands of people likely died due to Gigantomanchia's rampaging, and they couldn't stop Tomura in the end.
Its a phryic victory at best, with the heroes own faults being exposed, with Hawk being a murderer, and Endeavour being an abuser.
I think that's more than enough to see why some heroes are reconsidering their careers.
The destruction left in the wake of this event cannot be helped but be blamed upon the failures of the heroes, since the heroes couldn't step up to stop him
Or Maybe the Villains were too strong to begin with?
It makes no sense to blame this on Heroes. They didn't intentionally stop doing their best to let Villains amputate n kill them. Instead they prepared in advance, did their best and this is the result, barely winning is if that must be.
(This is also why All Might importance was so big in the series, and only OFA is the solution to thiz.)
Plus, Heroes already thiz messed up rn, they need the public support the most right now. But the instead folks will believe few villains that are main cause of everything that happened to put all the blame the Heroes for it? Why? Because people have human tendency to easily put blame on others and Heroes are going to be crux of this despite risking their lifes.
So ofcrs Heroes will consider resigning. This much destruction isn't what they signed up for (not all Heroes can face strong Villains)
and get distrusted by public on top of that. In fact it might even lead to some injured Heroes turning bad like we usually saw in other Tv series.