The trashing other projects has always been a hard one for me. I see the issue of turning people off but I also see the value it provides of acting like a community immune system to protect users. It turned me off to projects like Samourai Wallet, that were known for being toxic, at first. That being said with enough time most of the issues they raised, albeit crassly, were often proven correct. That leads me to think it comes from a sense of wanting to protect users from falling for a scam.
I can relate in way. When @dlive left Steem to create their own blockchain I reacted in normal maxi fashion and was very toxic to anyone that supported that traitorous scum. I knew they were doomed to fail and I felt like they had clearly shown their lack of honor. I felt like it was clear to see what their plan was and that if anyone was supporting them they were attacking truth in a way. I think I've been proven right with time about the platform but in the short term I know of a couple users that left Steem right along DLive that might not have had I not been so crass towards them.
Was the loss of those relationships worth it? I don't know that I could answer that but I do feel bad that they ended up missing out on Hive. That being said the ones that did stick around and put up with the fire are now doing great on chain here. Maybe it improved this community be keeping those just seeking to leach value away and moved them off onto LINO?