Botnets are a non-issue dude, they're a finite resource that most people need to pay for. Anyone owning high end GPU cards should have an antivirus .. end of story (in fact most monero virsues are picked up quite fast these days because of the unicorn botnets).
Since when botnets and virsuses stop being a problem?
Viruses makes currency using unfair. Botnets makes currency not liquid. Imo you are not right, bro.
Botnets have zero effect on a currency being liquid. This is one of the stupidest arguments ever.
It doesn't really matter who mines the coins. Botnets secure the block chain just like everyone else, and as explained they are a finite resource, they will come and go depending on the profitability of mining one coin vs. mining another coin vs. doing something other than mining. Mining is actually not really their ideal use because it has a high footprint, so increased detection (and therefore elimination) of nodes.
Also, since you seem to be one of the BCN sock puppets, I'll point out that BCN is exactly the same as MRO mining. Botnets are an issue for both or neither. (I think neither, but if you disagree, and think both, then take it up with the BCN guys too.)