It is a good ethical question and I think it is great you think about it. I also think it is a good idea to have a discussion about it.

Here are my two cents:

There are believers and disbelievers and there is another group: people who don't know yet. I think they are the important group and for them it is helpful to go into details. I understand it means you get maybe responses from believers and then it seems to be an unending circle. I think you can tackle that by being rational and friendly all the time, even if you think it is utter nonsens that is proclaimed. Correct and rational behaviour beams knowledge and will help making your point.

Another reason to say yes is because of words. Not everybody is great with words, you are. So by making videos debunking conspiracy theories you are actively helping people finding words to argue and creating an understandable opinion.

Now to be mean, there are also people who believe what they hear the most. They probably don't realise that for themselves but it creates the situation that your voice matters because of numbers of people speaking out.