The fact people are already coin hoping is no reason to give them a completely hands off way of doing it, and doesn't magically absolve you from being part of the problem. Its not the coin devs that don't like it, its the people mining the coin the 99% of the time its not top of coinchoose (presumably because they believe the coin has merit). Your pool hops on, owns the network for 20-30min until diff adjusts, then hops off, leaving the actual coin supporters left with another grind at a higher than required difficulty. Remember what happened to FTC, and being stuck on a ridiculously high diff? Your doing similar, on purpose, on an almost daily basis. Thankfully most coins adjust at an appropriate rate to not require hard forks these days, but it doesn't mean the affect isn't felt.
The FTC developers addressed the problem and it is now not a problem for that coin anymore. It's not my or my miners' fault if other coins, even with the benefit of prior knowledge of what happened to FTC's, continue to build copycat coins from LTC source without tweaking anything to avoid this.
I'd also like to note that 'coin jumping' wouldn't be as much of a problem if coin devs built an organic base of supporters rather than bribing exchanges to add their coin as the first thing they do.
As I mentioned, generally at least coins these days are built so as not to require a hard fork like in FTC's case, but it doesn't mean the affect isn't felt by every other miner mining the coin outside of coinchooses 30min window of profitability.
Coin jumping also wouldn't be as much of a problem if your pool and its hundreds of Mh/s didn't hop around on purpose, automatically, every single day. Yah there are individual programs out there (as someone previously linked), but even that is on a per miner level (and in one case doesn't actually appear to automate any switching based on another websites data), its just for when a person decides to mine a new coin.
All these coins your railing on for having no real support, or bribing exchanges, or not building a userbase ect. would probably be dead by now if not for coin hoping, at which point you'd then see not all the coins are in this same boat. Some would survive just fine.
Your a leader in a dangerous race to the bottom, where no one actually cares about anything but a profitability number on a website, that is likely out of date by the time they have said coins anyways. Building a community, infrastructure, a strong base, people hopping coins on a daily basis aren't contributing to any of that...so...what are they contributing to then? What are you?