They're real easy to knock into the palm of your hand and squish...
i agree that leaf-foot bugs is more likely than assassin bugs, due to the number of them.
This Spring... I've been catching the leaf foot adults mating on my poppy pods... and squishing. More recently I've been seeing groups of babies on these same pods, where I wasn't fast enough seeing some of the adults...
I usually see them moving to the tomato plants after the poppy pods are all gone.