Is it that hard to change? Is it that hard to accept you were maybe wrong?

I don't get ppl who refuse to say they were wrong and instead try to defend themselves even more when they're already aware that they're wrong. It makes my blood boil because I wouldn't give a shit if you were rude if you actually said sorry and try to make up for it or heck just say even sorry. Instead they hold onto it until they die, whateven pisses me off is those tiktok vids where their bullies from elementary or highschool is now on a medical field and they say "they wouldn't do that." shit was in the past. That person is obviously trying to do better now, it doesn't erase what they did to you but it's stupid that there obviously trying to better in life, be ACTUALLY helpful to ppl instead of tormenting them. I saw this with a girl who said their bully from middle school, was ableist but now they're taking psychology. Do these people just not get that maybe these people weren't aware of their actions? It doesn't excuse them or that you as a victim have to forgive them but you need to accept the fact someone's actually becoming better. Be fucking glad they're not being corrupt politicians or a criminal and turned for the better.