Earlier quoted context omitted.
I'm sorry, but your examples are quite out of context. Read the story about Sarkeesian's thing. Those people were there specifically for harassment. I cannot be upset at her for calling him out, and I cannot be upset that he was banned. As for the other one, you're gonna have to provide proof.
Not that it's worth wading too far into this, but there is no good reason to believe those people were there specifically for harassment. For one, if they were there to harass, you would expect them to have done some harassing. I have seen no examples of that. The only possible thing that could be construed as harassing behaviour was them being there in the first place - and I don't think that's a very high bar to se…
Yes, their is. Their behavior, both at the event and their prior behavior online towards her both suggest that is the entire reason for them being there.