Encourage them!
Downside first: T-Ball questions are probably not of interest to many (a majority?) of our power users. So having more of them would, basically, add more noise. But I don't think this negative point is a deal-breaker.
On the upside...
– This does a lot to make people (people new to this stack) feel welcome if we all respond positively.
– It builds up a set of easy/common answers to T-Ball questions. Which a) helps people who are new to NetEng (the field of work) and b) makes us even more of the go-to stop on the Internet.
Action items for you...
See a T-Ball question? Up-vote! Even if you don't bother reading the answer, commenting or anything... just up-vote the question. Put another way, don't think "well, that's a simple/easy question." and then totally ignore it; Give it a bump!