Flush draw: calling a flop bet, or raising for free card??

[Beck]

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One exception to this recommendation might be when either the flop is coordinated (7-8-9 for example) or all random low cards (such as 2-5-7). For the low-card flop, depending on the players at the limit you play at, people in later positions will call a bet and a raise with any 2 big cards, figuring that such an "ugly" flop couldn't have helped anyone. So you have to figure out if the players behind you are likely to fold to your raise.

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But would it be that terrible if someone behind me called only with overcards?? I mean, as long as 2 people come along (early bettor and late position coldcaller) I should be fine, right?

Normally I do raise in these situations.I was just interested under which conditions I shouldn't raise.