Some rando on the internet isn't going to be able to prove or disprove this. You believe what you want based on what evidence is available to you.
Myself, the imagery I've seen of the multiple very expensive and very powerful outboard motors on these boats is enough for me to believe that these are not in fact honest fishermen. It's totally incongruous.
We don't have images / videos of all strikes. We don't have anything from the strike that the Colombian president claims was on a fishing boat, for one.
If you really want to go far enough with it, given the administration's general lack of trustworthiness, we don't even have confirmation that all the videos we've been given correspond to the strikes we've been told they correspond to.