So you can guarantee that all of them crammed into a 10g - with no heater, filter, etc are going to be as healthy as they were when they were caught? You can be certain they haven't got any parasites?
In Pennsylvania (my home state) it is illegal to keep native species in home aquariums.
It's not about me being uptight. It is about doing the right thing. Boaters have to clean their boats before going to different lakes to keep invasive weeds out. Would you ignore those laws as well because the legislature is too uptight?