Again, questioning the motivation of someone who raises a point you don't have an answer for is no better than trying to change the subject when you feel like you can't win on the merits.
If you think it's a good use of the money, then defend it.
But changing the subject and questioning people's motivations, or insisting that all larger forms of abuse in the military be talked about before anyone can call into question our aid to Israel - that's not a legitimate argument.