You're more likely to encounter an inattentive or distracted driver than one who's deliberately aggressive. Offhand the only deliberately aggressive drivers I've encountered were two lanes away from me and just hollering or cussing, but not close enough to threaten me physically or for my riding to affect them. But the close calls have been from drivers distracted by their phones, inattentive or misjudging the relative distance and speed between my bike and their vehicles -- that's the usual reason for left or right hook cutoffs.

Most folks I encounter are very considerate and courteous. Those drivers far outnumber the handful of careless and rude drivers.

But I do usually ride with an Ion Speed Pro video camera to record incidents, especially if I happen to be injured and unconscious. Rarely does anything happen so I delete the videos when I get home. I've reported only one instance of reckless driving, when a Domino's delivery driver cut me off a few weeks ago -- the store manager and corporate safety officer responded satisfactorily so I didn't pursue it. Occasionally I'll record and keep entertaining videos -- group rides, recent holiday lights, etc.

For $200 you can buy one GoPro Session or two of several other action video cameras, including some that are discontinued or near end of cycle but still available: Contour Roam, Ion Speed Pro, Polaroid cube, Mobius, several knockoffs of the earlier GoPro Hero squarish camera design.

The two major 360 cameras cost well over $200. The Ricoh Theta is around $300 or more, and the resolution isn't quite good enough yet to record US license plate detail. The Nikon Keymission is around $500 and may have good enough resolution to record US license plates.

The future of action cams will be 360 types, but they haven't yet reached the sweet spot of satisfactory resolution at a price the market will bear.

Regarding the conventional video cameras that can be mounted on bikes, keep in mind a few factors:

• Some are designed more for action sports and close proximity, not for documenting traffic incidents and license plate detail. An ultra wide angle lens with nearly fisheye 170 degree field of view coverage at the typical moderate resolution will often struggle to record US license plate detail. A lens closer to 120-140 degree FOV will cover less overall but is more likely to record fine detail. Personally for traffic documentation I'd prefer a 60-90 degree FOV, equivalent to a 20-35mm lens on a full frame/35mm film camera. But a narrower FOV demands more precise aiming, which requires a rear LCD screen or laser aiming device (like the Contour Roam).
• Some are action cameras, some are dashboard cameras. There are some great values in low priced dash cams but they usually aren't weatherproof and may not hold up to the vibration and shock of bicycle riding. Weatherproof housings may be available at extra cost and bulk for dash cams.
• Most action cams will run 60-120 minutes on a single charge of the built-in battery, with 90 minutes being the current average. Some can be extended by plugging into an external USB battery. If you plan to ride longer than 90 minutes be sure the camera you choose can both run and charge off an external battery. Keep in mind that using an external battery may compromise the weatherproof integrity -- for example, my Ion Speed Pro is rainproof with the rear cap in place, but not when the cap is removed to access the rear USB port for charging/continuous recording while riding.
• Action and dash cams can be picky about recording media cards. Several models have customer complaints about glitches. The manufacturers will often suggest using only a name brand Class 10 or similarly compatible card from SanDisk, Lexar, etc. And beware of counterfeits, especially if a name brand top quality media card is selling for a much lower price than reliable vendors (check B&H, Adorama, etc., for guidelines to reasonable retail prices).
• If you ride at night you'll probably find most affordable action cams to have poor to mediocre image quality at night. The GoPros usually have better low light image quality. Some dash cams may have better nighttime quality, but again these may not be weather resistant or shock resistant without a protective housing.