That depends on your objection. If your object to the fact that no tank man results were shown, then yeah, maybe that's a fair argument. But if you object to the decision to remove tank man results, then it makes no sense to penalise Duck Duck Go for that. In fact, if you trust Duck Duck Go's authors more than Bing's, you might want to actively direct traffic to them in the hope that they can obtain enough users to become independent.

Even those who take ideological stands can object to purity. The FSF publishes the LGPL alongside the GPL and even has an exception to the GPL for GCC, to make it usable also by those who aren't fans of their position