No, you're conflicting two different things. DDoS is obviously illegal as you're attacking someone else. The "forced to host a tenant that they object to" the other commentator is mentioning is regarding not liking their speech and ideas, not actions. Of course we should try to stop illegal activities that actively harm others. When it comes to Parler, it's unclear if Parler themselves were active in inciting the violence, just members who happened to be using Parler, or if they are related at all.