You are absolutely correct - it is wise to use a unique email address if at all possible, and please report misuse to
compliance@arin.net.
It does make a difference, as abuse reports result in discussions with organizations regarding appropriate reeducation regimes for violating staff – and further implications if the pattern of abuse appears systemic as opposed to incidental.
(It is not a perfect system, as it often needs periodically refreshment in some orgs due to inevitable turnover and miscreant creativity, but it does tamp down the worst of the abuse that would occur otherwise…)