I'll say it again.
If the "Parkland 5" were only interested in a message of "hey, this was horrible, i'd like to make sure that this never happens again if possible. Can we all set aside our differences and find some common ground to make some headway here?"
That's the exact opposite of the approach they've taken. They've put their flag in the ground on the side of which they stand, which is banning/confiscating guns, and have joined in the nasty rhetoric employed by that side in demonizing their opposition. They've stepped way beyond just being "survivors" and firmly into the realm of supposed pundits. As such, they should be criticized for their views specific to their preferred ideology/policy.
As far as the rhetoric used to criticize. That's just our climate right now. Way too many people are using nasty language and throwing around dangerous accusations as it pertains to motives and such. It's a sad development.