My opinions... combat logging is cheating, use of solo is not cheating, piracy is part of the game but so is bounty hunting and bounties for murder should only be wiped on the pirate's death (since the game has no concept of incarceration).
If you want to "punish" the cowardly pirate for wiping his record so he can't be hunted, don't start committing your own acts of piracy, instead trade in solo or group to deprive him of his target. Pirates are probably the most vocal supporters of moving people back into open where they can be shot at, and traders go to solo/group coz piracy has been left to develop on it's own rather than being supported within a balanced game system, so depriving them of targets so they complain more is probably the best way to get FDev to fix the issues pushing so many traders into solo/group in the first place.
Traders want to trade and make.profit, pirates want traders in open where they can be robbed, and bounty hunters want pirates with bounties to be hunted. Right now traders are going solo/group NOT because pirates exist, but because they flourish uncontrolled on lucrative routes. If pirates want traders in open the traders need to have a good chance (not 100%, but high) of trading the profitable routes unmolested. Yes traders should face some risk, but no trader is going to keep going keep going back to a route that he always gets robbed on. The whole "raison d'etre" for trading is profit not charity, losing profit occasionally can be absorbed as a "cost of doing business" but losing it too often will have the trader looking elsewhere. That is WHY pve groups are flourishing (mobius group is now over 5000!). We've all seen nature docos of zebras or wilderbeqst crossing an african river and getting eaten by crocodiles. Why do they keep doing it? Because there is something on the other side that they want but more so because 99.9% of them make it across safely. If they start losing 20-30% of their herd to the crocodiles they will go find another way across. That's what the traders have done - their losses were too high so they found another way to trade. A more boring way perhaps, but without the too high losses.
Of course, to give them their due the pirates feel justified in hunting on lucrative routes, for the same reason as sharks hang out where fish like to feed, coz that's where the prey is! Pirates, be they "gentleman pirates" or "psycopathic scoundrels" are proud of being hunters and see traders as their natural prey, but if they want to be part of a food chain though, they need to accept that they're not the lions, they are the jackals and that the bounty hunters see THEM as prey, and that if a predator is decimating their prey in a certain area the prey will either die out or move away. A pirate clearing his bounty so he's not hunted is exactly the same as a trader going to solo or group so he's not pirated. The only difference is that the pirates complain about the traders hiding, when the pirates are doing the same thing. Hypocrite much?
Put in systems to support a viable trader/pirate/bounty hunter ecosystem and trqders will start seeing pirates as "fun" rather than seeing them as circling sharks and may start returning to open, and pirates will in the same way see the bounty hunters as "fun" rather as a nuisance out to spoil their trader hunting ways.