The way people are exposed to information and ideas has changed a lot over the years, especially with the rise of smartphones, social media, and just the Internet as a whole. However, this doesn't eliminate the viability of writing as a means of activism. Writing will always be useful, especially for marginalized groups for the simple fact that it costs virtually nothing. Video content viewers and creators can easily get too distracted by production value, or lack thereof. Sometimes the people who have the most to share can have little resources to put it out there, so writing is sometimes the only critical content that they consistently put out. Furthermore,there will always be like minded or just curious people who are interested enough to read up on a topic with a compelling or bold take. Sometimes these are the people who feel inspired enough to go out and make social media posts, or the ones involved in organizing marches. Writings role in activism may have changed but it still exists, and it's an important one. 

From the moment a child talks it means that they have been listening to what you say. In my understanding, adults tend to complain a lot in front of kids not knowing that the first instinct of a child is to mirror the behavior of others. I believe that adults should be careful when talking about big issues in front of young children because they will pick up this negativity and, over time, become negatively programmed themselves. However, you should never shield kids from world events. I recommend adults to level with the kid in an age-appropriate and reassuring way because they are powerless to address anything in their life but have the right to understand that there are certain things that can affect them.