I see a precedent in that we don’t sit in someone else’s seat, whether l’havdil showing kavod to rabbis, parents or just honoring someone’s makom in shul.
Does a lack of planning on your part (in getting where you need to be in order to daven on time) permit you to violate dina d’malchusa dina?
I guess if you have $250 to burn if you get a ticket, that’s your choice, but that’s a lot of money that would be better put toward tsedakah.
Finally, how would you feel if you had a valid health issue, NEEDED to use a handicapped spot, but they were all taken by people who “just needed to run in for five minutes” and then got distracted and ended up shmoozing, keeping you from getting the medication you NEED for Shabbos?
IMHO it’s selfish to excuse this behavior because ‘there are too many spots’. Plan ahead.