It's not just a matter of the rep differential between upvotes and downvotes. Poor-quality answers that agree with the biases of a significant percentage of people often receive highly positive scores.
This is a well-known and long-standing problem with the Hot Network Questions list. Sites that have controversial topics (such as Politics, Skeptics, etc.) ...
Don't roll back bumping edits. Mod flag
Edits like that should be mod flagged so a moderator can review them. Normally I would wait until a pattern has emerged, but the user is transparent about why they are doing it. Bumping is not allowed (it's more common to post a NAA but edits do the same thing)
Let me cold-shower you by saying that any changes to the reputation system are highly unlikely to take Politics.SE into account. The MSO rules boffins that may have some pull with the company/staff generally don't come from this site or care much about it.
As far as I know it's not possible to make local changes to such rules, and they probably don't see a ...
There's a daily rep cap of 200 per day. The only ways to go above it are to get the +15 bonus that comes when your answer is accepted or when you receive bounties.
If the user downvoted an answer at some point during the day, there will be a point at which they'll be sitting at 199 rep for the day, hence the +1 for an upvote.
I don't think we need to make more of it than it actually is. Editing itself is not something to be discouraged, unless it's excessive.
If you think there's abuse, flag it for mod attention and explain. The mods can keep track of what's going on even if things are deleted and without accusing people in the open when it's just an accusation. Note that abuse ...
The +4 relates to the total amount of rep points obtained, not the number of votes; upvotes add 10 points while downvotes subtract 2. 10-3*2 = 4
Note that the Reputation box in the profile summary only shows recent reputation events - see this related meta post - not overall totals of reputation gained from a post. You can see the full breakdowns here.
Amusingly one of my first contributions to an Electronics SE question resulted in the mods locking down my answer because they thought I was editing it to bump it to the main page (which I had no idea how it worked at the time). So yeah, mods can do that. Whether it's always the appropriate thing to do... it depends, I suppose.
But I thought minor bump edits weren't an issue and weren't supposed to be discouraged ?
If the policy hasn't changed since I asked that meta question 4 years ago, just ignore the minor edit. If it has changed, then pardon me.