I see your point. Applying this same principle then we could say anyone opting for optional anonymity by using monero or zcash instead of bitcoin is looking suspicious.
That is true if monero or zcash remain niche activities. One could say that the culprit is then the unfortunate existence of bitcoin
This is like right now, where it becomes suspicious to withdraw cash. There's nothing that can be done concerning anonymity if most people can opt to use a system which entirely exposes private matters. The only thing we can hope is that sufficient users will use a privacy-protecting system, so that the use in itself of that system is not something that is suspicious as such. But there's no reason to build a system that only allows you to opt in for that privacy protection. It is much better to attract people to a system for different reasons, and to protect their privacy by default.
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A large % of people who opt to use ZEC instead of BTC will also opt to use the Z addresses instead of the T addresses.
Actually no. Right now, I haven't looked any more, but a month after launch, only about 6% of transactions were done with Z addresses. Most were 'in the clear'.