We can do so out of compassion. If you see a child about to eat a glass shard will you just stand there?
People who are ignoring Dhamma or not are willing to learn it or practice it, or they are not interested, etc. are not children who are about to eat glass, if you think this way you will pretty much suffer as there is no way to changing the people or the world, being idealistic will cause a lot of harm to yourself. Focus on Nibbana first then you may try to bother with people if you are even willing
And why did the Buddha travel to teach Angulimāla?
Buddha and Arahants ignored many people in suttas for various reasons, you can not compare yourself to Buddha and do not do that or you will be delusional about yourself. Just because you find this site and it has an impact on you – you should not suddenly think that you are “bigger” than you are. This is a mistake that plenty of new people make before realizing the depth of Dhamma and how much there is to understand before opening your mouth to speak about Dhamma.
Sometimes even being an Arahant is not enough to teach Dhamma and some Arahants vary when teaching for various reasons. Sotapanna is not enough to teach on a high level as you will be agitated with people and you will do “dispromotion” for Dhamma as people have always high expectations for “spiritual” people, super unrealistic expectations.
**Keep in mind I’m talking about being like a “missionary” or trying to “save” people through Dhamma. Creating spaces like this site or aiming for people who are “seekers” looking for spiritual liberation is okay.