Yes, I do for the reasons mentioned above. I think some type of blocking feature would be useful if you just don't want to deal with the user. I'd say though that it should cost you some sats and then potentially if person gets blocked a lot it could cost them more sats to post too :)

Undesirable activities should cost more sats, but at the same time we need to incentivize censorship resistance... so this is a bit of balance that will be changing over time too :)